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# Directory Listing of Routines

# projects/themis/spacecraft/fields

- BESSEL_FILTER_RESP
- BUTTERWORTH_FILTER_RESP
- SCM_CLEANUP_CCC
- SPIN_TONES_CLEANING_VECTOR_V5
- SPINFIT
- THM_CAL_EFI[1]
- THM_CAL_EFI[2]
- THM_CAL_EFI[2]
  To be used on THEMIS EFI 3-vectors. Labels x-axis as "E12
- THM_CAL_EFI[3]
- THM_CAL_EFI_NONTD
- THM_CAL_FBK
- THM_CAL_FFT
- THM_CAL_FGM
- THM_CAL_FGM_DAC_OFFSET
- THM_CAL_FGM_SPIN_HARMONICS
- THM_CAL_FGM_SPINTONE_REMOVAL
- THM_CAL_FILE2OFFSET
  searches for the current calibration in ASCII file
- THM_CAL_FIT
- THM_CAL_SCM
  calibrate THEMIS SCM data
- THM_COLLATE_INTERVALS
- THM_COMP_EAC_RESPONSE
- THM_COMP_EFI_RESPONSE
- THM_COMP_SCM_RESPONSE
- THM_DFB_DIG_FILTER_RESP
- THM_EAC_FILTER_RESP
- THM_EFI_BOOM_DEPLOYMENT_TIME
  Provides the boom_deployment time(s) for EFI on THEMIS
- THM_EFI_DESPIN
- THM_EFI_SDT_TEST[1]
- THM_EFI_SDT_TEST[2]
  Checks houesekeeping data to flag the presence of EFI SDT (Sensor
- THM_FBK_DECOMPRESS
- THM_FFT_DECOMPRESS
- THM_FFT_FREQ_BINS[1]
- THM_FFT_FREQ_BINS[2]
- THM_FGM_FIND_SHIFT_1P1C
- THM_FGS_SPIKE_CORRECTIONS
- THM_GET_EFI_CAL_PARS
- THM_GET_EFI_CAL_PARS_NONTD
- THM_GET_FBK_CAL_PARS
- THM_GET_FFT_CAL_PARS
- THM_L1B_CHECK
  Tests for L1B (Estimated spin-axis Bz from spin-plane components),
- THM_LOAD_EFI
- THM_LOAD_EFI_L2
- THM_LOAD_FBK
- THM_LOAD_FFT
- THM_LOAD_FGM
- THM_LOAD_FIT
- THM_LOAD_SCM
- THM_SCM_DECONVO_VEC[1]
- THM_SCM_DECONVO_VEC[2]
- THM_SCM_MODPHA
- THM_SCW_DEGAP
  Helper function for thm_cal_scm, this interpolates over short gaps
- THM_SPINAVG[1]
- THM_SPINAVG[2]
  average data over spin periods, and return a tplot variable
- THM_SPINFIT
- THM_TEST_FGMCAL
- THM_UNPACK_HED
- TIME_DOMAIN_FILTER

# Routine Descriptions

## BESSEL_FILTER_RESP

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    function bessel_filter_resp(f, fc, N)
    purpose: Calculates the transfer function of an N-pole Bessel filter
             with a given cutoff frequency Fc.
     Inputs: f    freqency in Hz
             fc   Cutoff frequency in Hz
             N    Number of poles (4 or 5)
     Output: complex transfer function at given frequencies

(See projects/themis/spacecraft/fields/bessel_filter_resp.pro)

## BUTTERWORTH_FILTER_RESP

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    function butterworth_filter_resp(f, fc, N)
    purpose: Calculates the transfer function of an N-pole Butterworth filter
             with a given cutoff frequency Fc.
     Inputs: f    freqency in Hz
             fc   Cutoff frequency in Hz
             N    Number of poles (must be 1, 2 or 4)
     Output: complex transfer function at given frequencies

(See projects/themis/spacecraft/fields/butterworth_filter_resp.pro)

## SCM_CLEANUP_CCC

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    FUNCTION: SCM_CLEANUP_CCC

    PURPOSE: cleans 8 hertz and harmonic instrument noise from scm data using
           superposed epoch analysis.
    	The raw data is high pass filtered above 4 Hz and then averaging on
    	this filtered data is performed to determine the noise.
    	Returns de-noised data and stores tplot quantity of this data

    INPUTS:requires 3-component single spacecraft data structure from thm_load_scm

    OUTPUT: data structure of 3 component cleaned data

    KEYWORDS:
      probe: use this keyword to specify spacecraft if other than 'a'
      clock: set keyword clock to base epoch on the 1 sec clock pulse closest to
             the start of the interval otherwise epoch is from the beginning of
             each interval

      ave_window: set keyword ave_window to define window length in seconds for
             averaging, Default 3 seconds in length
             note for technique to work the window length should be an integer
             multiple of the period of the noise
             that is being removed.

      min_num_windows: set keyword min_num_windows to define the minimum length
             of continuous data in terms of window lengths
             default is 10. The greater this number the more reliable the result.

      diagnostic: set keyword diagnostic to plot spectral data and to store the
             average noise, filtered (>4Hz) corrected signal,
             and corrected signal for the last continuous interval anlaysed

    SIDE EFFECTS: in current version data preceding the epoch for each interval
             is discarded

    HISTORY
    Chris Chaston 9-May-2007
    Modified by Olivier Le Contel 5th-July-2007
      in order to include it in thm_cal_scm_ccc.pro routine
      thm_cal_scm_ccc being a modified version of
      thm_cal_scm routine written by Ken Bromund and Patrcik Robert
    Modified by Ken Bromund 27-Sept-2007
      for inclusion in TDAS (use time routines available in TDAS)

    $LastChangedBy: aaflores $
    $LastChangedDate: 2012-01-09 15:50:20 -0800 (Mon, 09 Jan 2012) $
    $LastChangedRevision: 9520 $
    $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/scm_cleanup_ccc.pro $

(See projects/themis/spacecraft/fields/scm_cleanup_ccc.pro)

## SPINFIT

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    Name:
     spinfit
    Purpose:
     performs a spinfit on B or E field data, results should be
     equivalent to FGS or EFS datatypes
    Calling Sqeuence:
     spinfit,arr_in_t,arr_in_data,arr_in_sunpulse_t,arr_in_sunpulse_data, $
               A,B,C, avg_axis, median_axis,Sigma,Npoints,sun_data, $
               min_points=min_points,alpha=alpha,beta=beta, $
               plane_dim=plane_dim,axis_dim=axis_dim,phase_mask_starts=phase_mask_starts, $
               phase_mask_ends=phase_mask_ends,sun2sensor=sun2sensor
    Input:
      arr_in_t = time array for the data
      arr_in_data = the data to be spin fit
      arr_in_sunpulse_t = time array for sunpulse data
      arr_in_sunpulse_data = sunpulse data
    Output:
      A,B,C = fit parameters for spinfit
      avg_axis = the average over the spin_axis direction
      median_axis = the median over the spin_axis direction
      sigma = sigma for each spin period
      npoints = number of points in fit for each spin period
      sun_data = midpoint times of spitfit data
    keywords:
      plane_dim = Tells program which dimension to treat as the plane. 0=x, 1=y, 2=z. Default 0.
      axis_dim = Tells program which dimension contains axis to average over. Default 0.  Will not
                 create a tplot variable unless used with /spinaxis.
      min_points = Minimum number of points to fit.  Default = 5.
      alpha = A parameter for finding fits.  Points outside of sigma*(alpha + beta*i)
              will be thrown out.  Default 1.4.
      beta = A parameter for finding fits.  See above.  Default = 0.4
      phase_mask_starts = Time to start masking data.  Default = 0
      phase_mask_ends = Time to stop masking data.  Default = -1
      sun2sensor = Tells how much to rotate data to align with sun sensor.

    Example:
          thm_spinfit,'th?_fg?',/sigma
     20-sep-2010, changed sign of sun2sensor to insure agressment between
                  spinfit EFF and on-board EFS spinfit data, and between
                  spinfit FGL and on-board FGS spinfit data.
    Written by Katherine Ramer
     $LastChangedBy: $
     $LastChangedDate: $
     $LastChangedRevision: $
     $URL: $

(See projects/themis/spacecraft/fields/spinfit.pro)

## SPIN_TONES_CLEANING_VECTOR_V5

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    Procedure: spin_tones_cleaning_vec_v5

    Purpose:  compute an averaged signal with a specified averaging window duration
              and substract this averaged signal to raw signal

    keywords: none
     input :t_vec,VEC,wind_dur,samp_per
            t_vec is a time array
            VEC is a time vector
            wind_dur is the duration of the averaging,
            samp_per is the sample period of t_vec and VEC
     output :VEC_AV has the duration of VEC but is obtained by
                    duplicating the average signal over one averaging window
                    along the whole time period
                    the average signal is obtained by summing all averaging
                    windows within the whole time period
             VEC_CLEANED is equal to VEC-VEC_AV,
             nbwind is the number of averaging window within the whole time period,
             nbpts_cl is the number of points within the whole time period
                    i.e. also the dimension of t_vec_cleaned and VEC_CLEANED
    Example:
       spin_tones_cleaning_vector, t_vec,VEC,wind_dur,samp_per,$
                                   t_vec_cleaned,VEC_AV,VEC_CLEANED,nbwind,nbpts_cl
    Notes:
      This routine is (should be) platform independent.

    History:
     12 june 2007, written by Olivier Le Contel

    $LastChangedBy: aaflores $
    $LastChangedDate: 2012-01-26 16:43:03 -0800 (Thu, 26 Jan 2012) $
    $LastChangedRevision: 9624 $
    $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/spin_tones_cleaning_vector_v5.pro $

(See projects/themis/spacecraft/fields/spin_tones_cleaning_vector_v5.pro)

## THM_CAL_EFI[1]

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    Procedure THM_PUT_ELEMENT()

    Purpose:
      Put data into a substructure (1 level down) given the structure, the substructure tag name, and the data tag name.

    Syntax:
      thm_put_element , struct, sstruct_tag, data_tag, data

      where

      STRUCT:		The structure to receive the data.
      SSTRUCT_TAG:		The substructure tag name to receive the data (need not exist).
      DATA_TAG:		The data tag name.
      DATA:		The data.

    Keywords:
      None.

    Code:
      W. Michael Feuerstein, 16 June, 2009.

(See projects/themis/spacecraft/fields/thm_cal_efi.pro)

## THM_CAL_EFI[2]

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    function THM_GET_EFI_EDC_OFFSET()

    Purpose:
      Estimate the EDC offset by low-pass filtering the ADC data with a moving estimation window.  Returns all NaNs, if the data interval is shorter than
      the minimum number of spins (see MIN_N_SPINS kw).

    Syntax:
      result = thm_get_efi_edc_offset(Y, Sample_Rate, N_Spins, Spin_Period [, Offset_Estimation_Window_Truncated] [, NEW_N_SPINS] [, MIN_N_SPINS = <long>])

      where

      Y (n-element array)			Input		The ADC data needing the EDC offset calculation.
      Sample_Rate 				Input		The data rate.
      N_Spins 				Input		The width of the estimation window in # of spins
      Spin_Period 				Input		The period of a spin [s].
      Edge_Truncate			Input		Passed to SMOOTH, if SMOOTH is the estimation function.
      Offset_Estimation_Window_Truncated	Output		Indicates that the data interval is shorter than the estimation window requested, so the estimation
    							window has been truncated to the greatest integral number of spins that fit into the data interval.
      New_N_Spins				Output		If OFFSET_ESTIMATION_WINDOW_TRUNCATED is set, then this will contain the adjusted number of spins.

    Keywords:
      MIN_N_SPINS				I/O, long.  	1 <= MIN_N_SPINS <= NOMINAL_N_SPINS.  Specify the lower limit for NOMINAL_N_SPINS.  Defaults to 1.

(See projects/themis/spacecraft/fields/thm_cal_efi.pro)

## THM_CAL_EFI[2]

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    THM_UPDATE_EFI_LABELS.PRO

    PURPOSE:
    To be used on THEMIS EFI 3-vectors.  Labels x-axis as "E12
    (<coordinate system in DLIMITS.LABLES>)" for spinning coordinate
    systems and "Ex (<coord. sys. in DLIMITS.LABELS>)" for despun
    coordinate systems.  Y and Z axes are upadated correspondingly.  Call
    after coordinate transformations.

    SYNTAX:
      thm_update_efi_labels ,<String>

    Arguments:
      <String>: A TPLOT variable name referring to a 3-vector TPLOT variable.

    Code: W. Michael Feuerstein, 7/2008.

(See projects/themis/spacecraft/fields/thm_cal_efi.pro)

## THM_CAL_EFI[3]

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    Procedure: THM_CAL_EFI

    Purpose:  Converts raw EFI (V, EDC, and EAC waveform) data into physical quantities.

    Syntax:  THM_CAL_EFI [, <optional keywords below>]
    keywords:
       VERBOSE:		Input, >= 1.  Set to enable diagnostic message output.  Higher values of produce more and lower-level diagnostic messages.
       DATATYPE:		Input, string.  Default setting is to calibrate all raw quantites and also produce all _0 and _dot0 quantities.  Use DATATYPE
                           kw to narrow the data products.  Wildcards and glob-style patterns accepted (e.g., ef?, *_dot0).
       PROBE:		Input, string.  Specify space-separated probe letters, or string array (e.g., 'a c', ['a', 'c']).  Defaults to all probes.
       VALID_NAMES:	Output, string.  Return valid datatypes, print them, and return.
       COORD:		I/O, string.  Set to coordinate system of output (e.g., 'gse', 'spg', etc,... see THEMIS Sci. Data Anal. Software
    			Users Guide).  Defaults to 'dsl'.
       IN_SUFFIX:		Input, scalar or array string.  Suffix to expect when parsing input TPLOT variable names.
       OUT_SUFFIX:		I/O, scalar or array string.  Suffix to append to output TPLOT variable names in place of IN_SUFFIX (usally = IN_SUFFIX).
       TEST: 		1 or 0.  Disables selected /CONTINUE to MESSAGE.  For QA testing only.
       STORED_TNAMES: 	OUTPUT, string array.  Returns each TPLOT variable name invoked in a STORE_DATA operation (chron. order).  (Not sorted or uniqued.)
       ONTHEFLY_EDC_OFFSET:OUTPUT, float.  Return the EDC offset array calculated on-the-fly in a structure (tag name = probe letter, subtagname =
                           datatype).  *** WARNING: This kw can use a lot
                           of memory, if processing many datatypes, or
                           long time periods. ***
       NO_EDC_OFFSET:      I/O, 0 or 1. If set, do not preform an EDC offset calculation. Will also avoid dot0 and_0 calculations, and not perform coordinate transforms
       GAP_TRIGGER_VALUE: 	I/O, float, > 0.  For on-the-fly EDC offset calculation, consider anything greater than or equal to GAP_TRIGGER_VALUE to be
                   	a gap in the data.  Default: 0.5 s.
       NOMINAL_N_SPINS: 	I/O, long, >= 1.  Specify the number of spins for the on-the-fly EDC offset calculation estimation window, or
                        	read out the default (20 spins).
       MIN_N_SPINS:	I/O, long, 1 <= MIN_N_SPINS <= NOMINAL_N_SPINS.  Specify the lower limit for NOMINAL_N_SPINS.
       OFFSET_ESTIMATION_FUNC: OUTPUT, scalar string.  The name of the function used to estimate the EDC offset for the on-the-fly window.
       /EDGE_TRUNCATE: 	I/O, numeric, 0 or 1.  Set to 0 to disable edge truncation in SMOOTH (for the on-the-fly offset calculation).  Assign
                           to a variable to read the default (= 1).  Undefined, if on-the-fly offset not done.
       GAP_BEGIN, GAP_END: OUTPUT, double, >= 0.  Return (if they exist), the double-precision start and end times of all
                   	gaps detected in preparation for on-the-fly offset calculation.  See kw ONTHEFLY_EDC_OFFSET for structure format and warnings.
       TRY_DESPIKE:        If set, despike the raw E field data before
                           calibration, uses function SIMPLE_DESPIKE_1d
                           for the calculation.
       DESPIKE_THRESHOLD:  Threshold in ADC units for despike
                           calculation, the default is 200
       DESPIKE_WIDTH:      Half Width of the median filter used for the
                           despike calculation, the default is 11
       keyword parameters for _dot0 computation:

       MAX_ANGLE:		Input, float.  Maximum angle of B field to spin axis to calculate _dot0.  Typical = 80 degrees.  No default.
       MIN_BZ:		I/O, float.  Minimum value of Bz.  Typical value is 2.0 nT.  Default= 1.0 nT.  If argument not defined, returns default.  Not
    			compatible with MAX_ANGLE keyword.
       MAX_BXY_BZ:		Input, float.  Maximum value of abs(bx/bz) or abs(by/bz).  Typical value is 5. ~= tan(79 degrees) (think of Bx/Bz).  Default is
    			not to use this method (no default value).
       BZ_OFFSET:		I/O, float.  Offset in nT that will be added to Z axis measurement of B.  Defaults to 0.0.  If argument not defined, returns default.
       FGM_DATATYPE:	Input, string.  'fgl', 'fgh', 'fgs' or 'fge'.
       FGM_LEVEL:          Input, 'l1' or 'l2', default is 'l2'

     use_eclipse_corrections:  Only applies when loading and calibrating
       Level 1 data. Defaults to 0 (no eclipse spin model corrections
       applied).  use_eclipse_corrections=1 applies partial eclipse
       corrections (not recommended, used only for internal SOC processing).
       use_eclipse_corrections=2 applies all available eclipse corrections.

    Example:
       thm_cal_efi, probe='c'

    Modifications:
      Added boom_shorting_factor_e12, boom_shorting_factor_e34,
        offset_e12, offset_e34, offset_dsc_x, offset_dsc_y
        fields to data_att structure in the default limits structure.
        Also, added mechanism to fill new field from
        THM_GET_EFI_CAL_PARS.PRO, W.M.Feuerstein, 2/26-27/2008.
      Changed "History" to "Modifications" in header, made "1000" a float ("."),
        switched all internal calibration parameters over to those read through
        THM_GET_EFI_CAL_PARS.PRO, WMF, 3/12/2008.
      Updated DATA_ATT fields to match revised cal. files, WMF, 3/12/2008.
      Updated error handling, updated doc'n, WMF, 3/12/2008.
      Updated doc'n, made datatypes more consistent (speed), WMF, 3/14/2008.
      Changed "no default" for MIN_BZ kw to default=1.0 nT, fixed MAX_ANGLE
        and MIN_BZ kwd's "both set" handling, WMF, 3/14/2008.
      Changed an NaN multiplication to an assignment (speed), simplified MIN_BZ
        default assignment, turned on good practice compile options,
        reorganized opening statements (flow), turned off ARG_PRESENT(MAX_BXY_BZ)
        bug (no default for this kw), updated doc'n, WMF, 3/17/2008.
      Now calculates Ez (_dot0 section) AFTER implementing MAX_BXY_BZ kw as per
        J. Bonnell's request (it also happens to be faster), updated doc'n,
        WMF, 3/18/2008.
      Removed redundant datatype conversions, WMF, 3/20/2008.
      Using BOOM_SHORTING_FACTOR in field calibration, WMF, 3/20/2008 (Th).
      Fixed potential logical vs. bitwise conditional bug, WMF, 3/21/2008 (F).
      Updated doc'n, WMF, 3/27/2008.
      Removed "TWEAK_GAINS" kw to THM_EFI_DESPIN.PRO per J.Bonnell's req.,
        WMF, 4/4/2008 (F).
      Added TEST kw to disable certain /CONTINUE to MESSAGE, and passed TEST
        through to THM_GET_EFI_CAL_PARS.PRO, WMF, 4/7/2008 (M).
      Implemented time-dependent EAD/EDC gain conditional, WMF, 4/22/2008 (Tu).
      Implemented time-dependent calibration parameters for v?? and
        e?? datatypes, WMF, 5/21 - 6/5/2008.
      Reconciled last three changes from non-time-dependent version: COORD kw is now not case
        sensitive, made sure 'E12','E34','E56' labels go with SSL and SPG coordinates and
        'Ex','Ey','Ez' go with all other coordinate systems (THM_UPDATE_EFI_LABELS.PRO),
        fixed COORD='gse' crash, WMF, 8/21/2008.
      Added error message for hed_ac = 255, WMF, 8/26/2008.
      Renamed from "thm_cal_efi_td.pro" to "thm_cal_efi.pro", WMF, 9/9/2008.
      Put in cases for 2 and 4 spin-dependent offsets in the boom plane, WMF, 3/4/2009.
      Insert on NaN on FGM degap, memory management, WMF, 5/5/2009.
      added no_edc_offset and _extra keywords, 19-aug-2010, jmm

    Notes:
    	-- fixed, nominal calibration pars used (gains and
              frequency responses), rather than proper time-dependent parameters.

     $LastChangedBy: jimm $
     $LastChangedDate: 2025-09-04 12:01:24 -0700 (Thu, 04 Sep 2025) $
     $LastChangedRevision: 33599 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/thm_cal_efi.pro $

(See projects/themis/spacecraft/fields/thm_cal_efi.pro)

## THM_CAL_EFI_NONTD

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     Deprecated, 2012-06-08, jmm

     $LastChangedBy: jimm $
     $LastChangedDate: 2012-06-08 14:44:13 -0700 (Fri, 08 Jun 2012) $
     $LastChangedRevision: 10523 $
     $URL $

(See projects/themis/spacecraft/fields/thm_cal_efi_nonTD.pro)

## THM_CAL_FBK

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    Procedure: THM_CAL_FBK

    Purpose:  Converts raw FBK (Filter Bank)  data into physical quantities.
    keywords:
      probe = Probe name. The default is 'all', i.e., calibrate data for all
              available probes.
              This can be an array of strings, e.g., ['a', 'b'] or a
              single string delimited by spaces, e.g., 'a b'
      datatype = The type of data to be loaded, 'fbh', 'fb1', 'fb2'.  default is
              'all', to calibrate all variables.
               due to some last minute changes it is required that you include
      both the raw and the calibrated datatype you want for this function
      to perform properly
      in_suffix =  optional suffix to add to name of input data quantity, which
              is generated from probe and datatype keywords.
      out_suffix = optional suffix to add to name for output tplot quantity,
              which is generated from probe and datatype keywords.
      /VALID_NAMES; returns the allowable input names in the probe and
      datatype variables
       /VERBOSE or VERBOSE=n ; set to enable diagnostic message output.
    		higher values of n produce more and lower-level diagnostic messages.

    Example:
       thm_cal_fbk

    Notes:
    	-- Changes between signal sources are handled;
    		source info from HED data should be used to get actual units of a given spectrum.
    	-- fixed, nominal calibration pars used (gains and frequency responses), rather than proper time-dependent parameters.

(See projects/themis/spacecraft/fields/thm_cal_fbk.pro)

## THM_CAL_FFT

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    Procedure: THM_CAL_FFT

    Purpose:  Converts raw FFT (on-board FFT spectra) data into physical quantities.
    keywords:
      probe = Probe name. The default is 'all', i.e., calibrate data for all
              available probes.
              This can be an array of strings, e.g., ['a', 'b'] or a
              single string delimited by spaces, e.g., 'a b'
      datatype = The type of data to be loaded, 'ffp_16', 'ffp_32',
      'ffp_64', 'ffw_16', 'ffw_32', or 'ffw_64'.  default is
              'all', to calibrate all variables.
      due to some last minute changes it is required that you include
      both the raw and the calibrated datatype you want for this function
      to perform properly

      in_suffix =  optional suffix to add to name of input data quantity, which
              is generated from probe and datatype keywords.
      out_suffix = optional suffix to add to name for output tplot quantity,
              which is generated from probe and datatype keywords.
      /VALID_NAMES; returns the allowable input names in the probe and
      datatype variables
       /VERBOSE or VERBOSE=n ; set to enable diagnostic message output.
    		higher values of n produce more and lower-level diagnostic messages.

    Example:
       thm_cal_fft

    Notes:
    	-- Changes between signal sources are handled;
    		source info from HED data should be used to get actual units of a given spectrum.
    	-- fixed, nominal calibration pars used (gains and frequency
        responses), rather than proper time-dependent parameters.

(See projects/themis/spacecraft/fields/thm_cal_fft.pro)

## THM_CAL_FGM

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    procedure: thm_cal_fgm

    Purpose: applies calibration to THEMIS fluxgate magnetometer data

             searches for the current calibration in ASCII file
             takes calibration that has time stamp before or at the start of the data
             converts data to nano Tessla
             applies the calibration
             corrects for phase shift from averaging before despinning

    keywords:
      probe = Probe name. The default is 'all', i.e., calibrate data for all
              available probes.
              This can be an array of strings, e.g., ['a', 'b'] or a
              single string delimited by spaces, e.g., 'a b'
      datatype = The type of data to be loaded, 'fge', 'fgh', or 'fgl'. If
             name_thx_fgx_in,name_thx_fgx_hed, or name_thx_fgx_out,$
             are specified, then this keyword is required.
      in_suffix =  optional suffix to add to name of input data quantity, which
              is generated from probe and datatype keywords.
      out_suffix = optional suffix to add to name for output tplot quantity,
              which is generated from probe and datatype keywords.
      coord = apply thm_cotrans if output other
              than spinning spacecraft (SSL) is desired.
      cal_dac_offset = apply calibrations that remove digital analog
                       converter nonlinearity by addition of offset.
                       Algorithm generated by Dragos Constantine
                       <d.constantinescu@tu-bs.de>. This is the default
                       process as of 7-Jan-2010, to disable, explicitly
                       set this keyword to 0.
      cal_spin_harmonics = apply calibrations from a file that remove
                           spin harmonics by applying spin-dependent
                           offsets generated by David Fischer
                           <david.fischer@oeaw.ac.at>. This is the default
                           process as of 7-Jan-2010, to disable, explicitly
                           set this keyword to 0.
      cal_tone_removal = fitting algorithm removes orbit dependent
                         spintone without removing scientifically salient
                         features. Algorithm generated by Ferdinand Plaschke
                         <f.plaschke@tu-bs.de>. This is the default
                         process as of 7-Jan-2010, to disable, explicitly
                         set this keyword to 0.
      cal_get_fulloffset = returns the offset used for spintone removal.(this keyword used for valididation)
                           Because there may be a different offset for each combination of probe and datatype,
                           This is returned as a struct of structs, with each element in the child structs being an N by 3 array.
                           For example, if offset_struct is the name of a struct with the return value from the cal_get_fulloffset keyword,
                             print,offset_struct.tha.fgl
                           Will print the fulloffset for probe a and datatype fgl.
      cal_get_dac_dat = Returns the raw data from directly after the DAC(non-linearity offset) calibration is applied.  For verification.
      cal_get_spin_dat = Returns the raw data from directly after the spin harmonic(solar array current) calibration is applied.  For verification.
      interpolate_cal = if it is set, then thm_cal values are interpolated to 10 min time intervals
     use_eclipse_corrections:  Only applies when loading and calibrating
       Level 1 data. Defaults to 0 (no eclipse spin model corrections
       applied).  use_eclipse_corrections=1 applies partial eclipse
       corrections (not recommended, used only for internal SOC processing).
       use_eclipse_corrections=2 applies all available eclipse corrections.
     no_spin_tone_batch: As of 2015-11-10, the deafult is to split the
        spin tone removal step into batches if the calibration parameters
        change during the input time range. Setting /no_spin_tone_batch
        turns this behavior off, and the full time range is used for spin
        tone removal. Use this for short time intervals.
     cal_file_in: A full path to the calibration file, for testing. This
                  will only work for single probe proecessing
     check_l1b: if set, then look for L1B data files that include
                estimates for Bz. This is the deafult for THEMIS E
                after 2024-06-01 (date subject to change....)
    optional parameters:

             name_thx_fgx_in   --> input data (t-plot variable name)
             name_thx_fgx_hed  --> header information for input data (t-plot variable name)
             name_thx_fgx_out  --> name for output (t-plot variable name)
             pathfile          --> path and filename of the calibration file

    Example:
          tha_cal_fgm, probe = 'a', datatype= 'fgl'

    Notes: under construction!!

    Written by Hannes Schwarzl.
     $LastChangedBy: jimm $
     $LastChangedDate: 2025-01-27 11:54:29 -0800 (Mon, 27 Jan 2025) $
     $LastChangedRevision: 33093 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/thm_cal_fgm.pro $
    Changes by Edita Georgescu
    eg 6/3/2007     - matrix multiplication
    eg 30/3/2007   - keyword deleted, fgmtype determined from: name_thx_fgx_in
                    - calibrates fgl,fgh,fge
                    - calibrate only mode=0 data
     2007-03-30 Modified by Hannnes S to use multiple calibrations for a selected interval
                and use spinperiod from the statefile
                Search this string to see changes ;Hannes 30/3/2007
     2007-03-30 Modified by Hannnes S correction for filter delay removed
                Search this string to see changes: Hannes 05/21/2007

(See projects/themis/spacecraft/fields/thm_cal_fgm.pro)

## THM_CAL_FGM_DAC_OFFSET

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    procedure: thm_cal_fgm_dac_ffset

    Purpose:
      Uses routine provided by Dragos Constanine to correct FGM offset from non-linearity of DAC(Digital Analog Converter)
      Specific routine from Dragos: thm_fgm_find_shift_1p1c.pro
      Calibration values from Dragos: thm_fgm_dac_corrections.dat

    Inputs:

      fgmdata: An Nx3 length array of fgm data in digital units.  fgmdata[*,0] = x,fgmdata[*,1] = y,fgmdata[*,2] = z
      probe: The probe letter, as a string.
      datatype: fgm data type can be (fgl,fge,fgh)

    Outputs:
      Mutates fgmdata in place.
      error: Set to 1 if error occurs, 0 otherwise

    Notes: This routine based largely upon routine fgm_correct_shift by Dragos Constantinescu

    $LastChangedBy: nikos $
    $LastChangedDate: 2015-09-16 10:41:52 -0700 (Wed, 16 Sep 2015) $
    $LastChangedRevision: 18806 $
    $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/thm_cal_fgm_dac_offset.pro $

(See projects/themis/spacecraft/fields/thm_cal_fgm_dac_offset.pro)

## THM_CAL_FGM_SPINTONE_REMOVAL

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     Procedure: thm_cal_fgm_spintone_removal

     Purpose:
       Tool to remove spintone from spinplane component FGM high resolution data
       by dynamical adaption and subtraction of bias field offsets

     Inputs:
       Time:    vector of time values
       Data_in:   corresponding spinplane component data, SSL x or y component
       Datatype: string  'fgl', 'fge' or 'fgh'

     Outputs:
       data_out:   corrected data vector
       offset:     removed offset data vector
       fulloffset: vector of all offset determinations (for validation)

     Author: Ferdinand Plaschke (2009-10-15)
             Replace AMOEBA with DFPMIN, Ferdinand Plaschke (2008-10-16)

     Minor modifications by Patrick Cruce(2009-10-15) for TDAS
               1. Rename with thm prefix
               2. Standardize documentation.
               3. Replace print with dprint.

    $LastChangedBy: nikos $
    $LastChangedDate: 2015-07-30 17:39:29 -0700 (Thu, 30 Jul 2015) $
    $LastChangedRevision: 18324 $
    $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/thm_cal_fgm_spintone_removal.pro $

(See projects/themis/spacecraft/fields/thm_cal_fgm_spintone_removal.pro)

## THM_CAL_FGM_SPIN_HARMONICS

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    procedure: thm_cal_fgm_spin_harmonics

    Purpose:
      Uses spin harmonic corrections from calibration files to fix spin harmonic errors in fgm data.
      The correction values are subtracted from the fgm data.  These values are downloaded from files
      in the data/themis/th?/l1/fgm/0000/spin_cal/ directory.

    Inputs:

      times: An N-length array of times matching the spinphase data and the fgmdata, in double precision seconds since 1970.
      spinphase: An N-length array of spinphase data in degrees.
      fgmdata: An Nx3 length array of fgm data in nT.  fgmdata[*,0] = x,fgmdata[*,1] = y,fgmdata[*,2] = z
      probe: The probe letter, as a string.
      shadows:A struct with shadow start and stop times retrieved from the new spinmodel.
                  {start:shadow_starts,stop:shadow_stops}

    Outputs:
      Mutates fgmdata in place.
      error: Set to 1 if error occurs, 0 otherwise

    Notes:
      1.  Specifically, this corrects errors due to the solar array current.  Thus it is only applied when the spacecraft is
            not in shadow.

      2.  The correction should largely remove the 1 Hz and .66 Hz harmonics from the X & Y components of the data and
      it should remove the .66 Hz and .33 Hz harmonics from the Z component of the data.(in DSL coordinates)

      3.  The .33 Hz harmonic of the X & Y components should remain.  There should be no 1 Hz Harmonic in the Z-component

      4.  If a calibration file is not found it will use a default calibration file.  This file will be the calibration file
            for the probe that corresponds to the latest month.  This could be an issue for dates very early in the mission,
            as there are no calibration files for these dates, but they are not temporally close to the default calibration values.

    $LastChangedBy: aaflores $
    $LastChangedDate: 2015-04-27 11:26:29 -0700 (Mon, 27 Apr 2015) $
    $LastChangedRevision: 17433 $
    $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/thm_cal_fgm_spin_harmonics.pro $

(See projects/themis/spacecraft/fields/thm_cal_fgm_spin_harmonics.pro)

## THM_CAL_FILE2OFFSET

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    NAME:
    thm_cal_file2offset
    PURPOSE:
    searches for the current calibration in ASCII file
    takes calibration data that brackets the input time range. If the
    time range is beyond the end of the file, then returns the data at
    the end of the file.
    CALLING SEQUENCE:
    thm_cal_file2offset, probe, time_range
    INPUT:
    probe = 'a', 'b', 'c', 'd', or 'e'
    time_range = the data time range
    OUTPUT:
    utc_out = time output unix time, N values
    utcstr_out = time string output
    off_out = Calibration offsets in DSL coordinate, 3xN
    cal_out = Cal quaternion matrix, 9xN
    spinper_out = spin period, N
    bz_slope_intercept_out = only nonzero for probe e, and only after April 2023 anomaly
    KEYWORDS:
    cal_file_in: A full path to the calibration file, for testing
     $LastChangedBy: $
     $LastChangedDate: $
     $LastChangedRevision: $
     $URL: $

(See projects/themis/spacecraft/fields/thm_cal_file2offset.pro)

## THM_CAL_FIT

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    Procedure: THM_CAL_FIT

    Purpose:  Converts raw FIT parameter data into physical quantities.
    keywords:
       /VERBOSE or VERBOSE=n ; set to enable diagnostic message output.
       higher values of n produce more and lower-level diagnostic messages.
       /ALL
       /no_cal will not apply boom shortening factor or Ex offset defaults
     use_eclipse_corrections:  Only applies when loading and calibrating
       Level 1 data. Defaults to 0 (no eclipse spin model corrections
       applied).  use_eclipse_corrections=1 applies partial eclipse
       corrections (not recommended, used only for internal SOC processing).
       use_eclipse_corrections=2 applies all available eclipse corrections.
     check_l1b: if set, then look for L1B data files that include
                estimates for Bz. This is the deafult for THEMIS E
                after 2024-06-01 (date subject to change....)
    Example:
       thm_cal_fit, /all

    Modifications:
      Corrected (reversed) polarity of Zscale in CPAR, WMFeuerstein, 5/13/2008.
      Call THM_GET_EFI_CAL_PARS.PRO and calibrate 'efs' data with EFI parameters, WMF, 5/13/2008.
      Mods per McFadden and Vassilis: Do not subtract spin-independent offset for 'efs'
        data, NO_CAL kw effectively sets boom_shorting_factor to 1 and spin-dependent offsets
        to 0, WMF, 6/27/2008.

    Notes:
     -- FGM range changes are handled during L0->L1 processing, no need to do it in this routine
     -- fixed, nominal calibration pars used, rather than proper time-dependent parameters.
       -- time-dependent spinn axis offset implemented Hannes 05/25/2007
       -- fixed trouble reading cal files with extra lines at the end,
          jmm, 8-nov-2007
     $LastChangedBy: jimm $
     $LastChangedDate: 2025-01-28 10:25:21 -0800 (Tue, 28 Jan 2025) $
     $LastChangedRevision: 33100 $
     $URL $

(See projects/themis/spacecraft/fields/thm_cal_fit.pro)

## THM_CAL_SCM

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    NAME:
     thm_cal_scm
    PURPOSE:
     calibrate THEMIS SCM data

        The processing is done in 6 successive steps (Step 1 is the first)
     ----------- by default, processing stops after step 5.

         # 0: counts, NaN inserted into each gap for proper tplotting
         # 1: Volts,  spinning sensor system, with    DC field
         # 2: Volts,  spinning sensor system, without DC field[, xy DC field in nT]
         # 3: nTesla, spinning sensor system, without DC field
         # 4: nTesla, spinning SSL    system, without DC field
         # 5: nTesla, fixed DSL system, without DC field, filtered <fmin
         # 6: nTesla, fixed DSL system, with xy DC field

    keywords:
      probe = Probe name. The default is 'all', i.e., calibrate data for all
              available probes.
              This can be an array of strings, e.g., ['a', 'b'] or a
              single string delimited by spaces, e.g., 'a b'
      datatype = The type of data to be calibrated/created.
              The default is 'scf', 'scp', and 'scw', that is, SCM full mode,
              particle burst mode and waves burst mode data, with no diagnostic
              outputs.
              Each mode of output has its own set of possible diagnostic outputs:
              'sc?_dc', 'sc?_misalign' and 'sc?_iano', where ? can be
              f, p or w.  To calibrate all modes loaded and create all diagnostic
              outputs you can specify 'all'.
              diagnostic outputs: raw data in Volts, dc field, axis misalignment
              (angle between x and y axes in degrees),
              and iano (data quality flag).  Created with '_dc',
              '_misalign', and '_iano' suffixes, respectively.
      in_suffix =  optional suffix to add to name of input data quantity, which
              is generated from probe and datatype keywords.
      out_suffix = optional suffix to add to name for output tplot quantity,
              which is generated from probe and datatype keywords.
      trange= array[2] string or double.  Limit calibration to specified time range

     use_eclipse_corrections:  Only applies when loading and calibrating
       Level 1 data. Defaults to 0 (no eclipse spin model corrections
       applied).  use_eclipse_corrections=1 applies partial eclipse
       corrections (not recommended, used only for internal SOC processing).
       use_eclipse_corrections=2 applies all available eclipse corrections.

      nk =    N points of the cal-convolution kernel, if set, this value will
              be used regardless of sample rate.
      mk =    If nk is not set, set nk to (sample frequency)*mk, where sample
              frequency is determined by the data. default 8 for scf, 4 for scp,
              and 1 for scw.
      despin =classic despin algorithm. 0:off 1:on  Default is on.
    n_spinfit=n spins to fit for misalignment, dc field calculation and
              optionally despin.
     cleanup= type of cleanup (default is 'none'):
              'spin' for only spin tones (power ripples) cleanup,
              'full' for spin tones and 8/32 Hz tones
              'none' for no cleanup processes.
     wind_dur_1s = window duration for 8/32 Hz cleanup (has to be a multiple of 1s)
              default is 1.
     wind_dur_spin = spintone cleanup window duration as a multiple of the spin
              period. Default is 1.
     clnup_author = choice of cleanup routine (default is 'ole'):
              'ccc' to use scm_cleanup_ccc
              'ole' to use spin_tones_cleaning_vector_v5
      fdet =  detrend freq. in Hz.  Detrend is implemented by subtracting a boxcar
              avg., whose length is determined by fdet.
              Use fdet=0 for no detrending.  Default is fdet=0.
      fcut =  Low Frequency cut-off for calibration.  Default is 0.1 Hz.
      fmin =  Min frequency for filtering in DSL system.  Default is 0 Hz.
      fmax =  Max frequency for filtering in DSL system.  Default is Nyquist.
      step =  Highest Processing step to complete.  Default is step 5.
      dfb_butter = correct for DFB Butterworth filter response (defaut is true)
      dfb_dig = correct for DFB Digital fiter response (default is true)
      gainant = correct for antenna gain (default is true)
      blk_con = use fast convolution for calibration and filtering.
              Block size for fast convolution will be equal to
              (value of blk_con) * (size of kernel).  blk_con = 8 by default.
              set blk_con=0 to use brute-force convolution.
      edge_truncate, edge_wrap, edge_zero= Method for handling edges in
              step 3, cal-deconvolution.  For usage and exact specification of
              these keywords, see docs for IDL convol function.  Default is to
              zero data within nk/2 samples of data gap or edge.
      coord = coordinate system of output.  Step 6 output can only be in DSL.
      no_download=don't access internet to check for updated calibration files.
      dircal= If set to a string, specifies directory of calibration files.
              use /dircal or dircal='' to use calibration files in IDL source
              distribution.
      verbose=set to zero to eliminate output.  currently only works with
              valid_names
    valid_names=use /valid_names to print out values for probe, datatype, coord
              and return those in named variables passed in to corresponding
              keywords.

    optional parameters:

      thx_scx      --> input data (t-plot variable name)
      thx_scx_hed  --> header information for input data (t-plot variable name)

    Example:
          tha_cal_fgm, probe = 'a', datatype= 'scp'

    HISTORY:
     13-mar-2007, jmm, jimm@ssl.berkeley.edu
     June-2007, krb, Based on Patrick Robert's cowave_THEscmwf.f
     25-sept-2007, krb, kenneth.r.bromund@nasa.gov
       merged in changes to version 893, made on 16-jul-2007 by
       olivier.LeContel@cetp.ipsl.fr, including Olivier Le Contel cleanup routine
       (spin_tones_cleaning_vector_v5) in thm_cal_scm
     23-jul-2008, jmm, added _extra to allow keyword inheritance
     jan-2010, ole@lpp.polytechnique.fr
     Modification to add Nan value only for last batch
     in step 6, start_step condition has been commented
     in outputs to tplot section, mode has been replaced by strlowcase(mode)
     18-may-2020, jmm, makes alt_scw the default, so scw data is degapped
    $LastChangedBy: jimm $
    $LastChangedDate: 2022-07-27 10:50:37 -0700 (Wed, 27 Jul 2022) $
    $LastChangedRevision: 30963 $
    $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/thm_cal_scm.pro $

(See projects/themis/spacecraft/fields/thm_cal_scm.pro)

## THM_COLLATE_INTERVALS

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    Purpose: Takes a bunch of intervals from different data sources and
    collates all intervals of the same source into a single vector(may be multidimensional)

    keywords:
             r: an array of data with dimensions [time,samples,sources]
             s: an array of source s[i] indices should have the source index of [*,*,i]

             returns: an array with dimensions [time,samples,sources] but
             all sources will be unique(ie the size of the output sources
             will be <= the input sources)

    Notes: --Used by thm_cal_fft,thm_cal_fbk
           --The returned data will be sorted according to source index in
           ascending order

(See projects/themis/spacecraft/fields/thm_collate_intervals.pro)

## THM_COMP_EAC_RESPONSE

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    	Procedure:
    		thm_comp_eac_response

    	Purpose:
    		Compute the voltage gain (magnitude only) as a function of frequency
    	for the DFB EAC channels.

    	Calling Sequence:
    	thm_comp_eac_response, sensor, ff, resp

    	Arguements:
    		sensor	STRING, ignored.
    		ff	FLOAT[ N], array of frequencies at which to compute the channel response.
    		resp	float[ N], array of |voltage gain| vs. frequency.

    	Notes:
    	-- none.

     $LastChangedBy: jbonnell $
     $LastChangedDate: 2007-06-28 18:00:35 -0700 (Thu, 28 Jun 2007) $
     $LastChangedRevision: 939 $
     $URL $

(See projects/themis/spacecraft/fields/thm_comp_eac_response.pro)

## THM_COMP_EFI_RESPONSE

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    	Procedure:
    		thm_comp_efi_response

    	Purpose:
    		Compute the voltage gain (magnitude only) as a function of frequency
    	for a given THEMIS EFI sensor (SPB or AXB).

    	Calling Sequence:
    	thm_comp_efi_response, sensor, ff, resp

    	Arguements:
    		sensor	STRING, one of SPB or AXB.
    		ff	FLOAT[ N], array of frequencies at which to compute the sensor response.
    		resp	COMPLEX[ N], array of voltage gain vs. frequency.

    	Notes:
    	-- none.

     $LastChangedBy: jimm $
     $LastChangedDate: 2012-05-22 11:57:35 -0700 (Tue, 22 May 2012) $
     $LastChangedRevision: 10450 $
     $URL $

(See projects/themis/spacecraft/fields/thm_comp_efi_response.pro)

## THM_COMP_SCM_RESPONSE

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    	Procedure:
    		thm_comp_scm_response

    	Purpose:
    		Compute the voltage gain (magnitude only) as a function of frequency
    	for a given THEMIS SCM sensor.

    	Calling Sequence:
    	thm_comp_scm_response, sensor, ff, resp

    	Arguements:
    		sensor	STRING, ignored.
    		ff	FLOAT[ N], array of frequencies at which to compute the sensor response.
    		resp	float[ N], array of |voltage gain| vs. frequency.

    	Notes:
    	-- none.

     $LastChangedBy: jbonnell $
     $LastChangedDate: 2007-06-28 18:00:35 -0700 (Thu, 28 Jun 2007) $
     $LastChangedRevision: 939 $
     $URL $

(See projects/themis/spacecraft/fields/thm_comp_scm_response.pro)

## THM_DFB_DIG_FILTER_RESP

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     function thm_dfb_filter(f, fsamp)
      purpose: Calculates the transfer function for the DFB digital
               filters at a given sample rate.
       Inputs: f     frequency in Hz
               fsamp Sampling frequency of telemetry signal.
                     Level of DFB filtering will be calculated
                     based on the raw sampling rate.
       Keyword:Eac   Set this keyword if the data is AC-coupled EFI data.
       Output: transfer function at given frequencies -- abs taken, since
               phase is adjusted for in L0->L1 processing.
       Author: Ken Bromund, as a wrapper around routines written by Chris Cully.
       Change history:
         2012-08-30: CMC. Added EAC support.

    $LastChangedBy: jwl $
    $LastChangedDate: 2012-08-30 14:10:35 -0700 (Thu, 30 Aug 2012) $
    $LastChangedRevision: 10886 $
    $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/thm_dfb_dig_filter_resp.pro $

(See projects/themis/spacecraft/fields/thm_dfb_dig_filter_resp.pro)

## THM_EAC_FILTER_RESP

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    function thm_eac_filter_resp(f)
    purpose: Calculates the transfer function of the DFB EAC anti-aliasing filter.
     Inputs: f    freqency in Hz
     Output: complex transfer function at input frequencies

(See projects/themis/spacecraft/fields/thm_eac_filter_resp.pro)

## THM_EFI_BOOM_DEPLOYMENT_TIME

[Previous Routine] [Next Routine] [List of Routines]

    NAME:
     thm_efi_boom_deployment_time
    PURPOSE:
     Provides the boom_deployment time(s) for EFI on THEMIS
     probes. Before this time, EFI and all ESA, SST, MOM, moments are
     problematic.
    CALLING SEQUENCE:
     boom_time = thm_efi_boom_deployment_time(probe = probe)
    INPUT:
     All via keyword
    KEYWORDS:
     probe = 'a', 'b', 'c', 'd', 'e', the probes for which you want the
             time
    OUTPUT:
     boom_time = the time of EFI boom_deployment for input probes:
     Dates for each Probe when boom deploy was completed:

    Probe                Boom Deploy Complete
    THA (P5)        14 Jan 2008, 1700 UT.
    THB (P1)        17 Nov 2007, 0600 UT.
    THC (P2)        16 May 2007, 2100 UT.
    THD (P3)        7 Jun 2007, 1700 UT.
    THE (P4)        7 Jun 2007, 1900 UT.

    Notes:

(See projects/themis/spacecraft/fields/thm_efi_boom_deployment_time.pro)

## THM_EFI_DESPIN

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     Despin routine for EFI high-res (eff/efp/efw) data.

     Syntax:
                    thm_efi_despin , probe, datatype, offset, gain [, NOTCH ] [, TWEAK_GAINS ] [, STORED_TNAMES ]

     Inputs:
             PROBE: Input, 1-character string identifying which spacecraft.
          DATATYPE: Input, string.  3-character string identifying data type ('eff','efp' or 'efw')
            OFFSET: Input, float, 1 x n (2 dimensions) 3-element array: Ex, Ey, Ez offset.
              GAIN: Input, float.  3-element array: E12, E34, E56 gain.
        TPLOT_NAME: Input.  String scalar containing the name of the TPLOT variable to operate on (regardless of PROBE and DATATYPE kwd's).

     Options:
             NOTCH: Numeric, 0 or 1.  Set equal to the # of harmonics to remove (including fundamental) (i.e. notch=1 removes fundamental only, notch=2 also
    		 removes 1st harmonic) (default=0 does not notch filter anything).  *** DISABLED ***.
       TWEAK_GAINS: Numeric, 0 or 1.  Set flag to tweak the E12/E34 gains to minimize the spin tone newname: If specified, the cleaned data is stored as a
    		 tplot variable with name=newname instead of the default 'th'+sc+'_'+datatype+'_dsl'.

     Outputs:
        *** Creates a new tplot variable with the name 'th'+sc+'_'+datatype+'_dsl' or whatever is specified by the newname keyword. ***

     STORED_TNAMES: Returns a string array containing each TPLOT variable name invoked in a STORE_DATA operation (chronological order).  (Not sorted or uniqued.)

     Restrictions:
          Required data must be loaded, including spin phase data.
     Notes:
        This routine ignores E56 when despinning.  That is desireable over
          the full transform (a la THM_COTRANS.PRO) because the resolution on E56
          is much lower than for the spin plane sensors (E12 and E34) so mixing
          in E56 would often increase the noise, and because the geometric
          axis is w/in 1 degree of the spin axis making the result effectively
          in DSL.

     Modifications:
        Switched from THM_SPIN_PHASE.PRO to Jim Lewis' SPINMODEL_INTERP_T.PRO,
          (commented out GET_DATA's to _state_spinper/spinphase, modified error
          conditional), edited warning message, up'd doc'n, W.M.Feuerstein,
          3/19/08.
        Added TPLOT_NAME to specify var. to read.  Otherwise, PROBE and DATATYPE
          parameters are used to derive tplot var. name to read.  Changed default
          suffix to "_dsz" to match the "THEMIS Science Coordinate Systems
          Definition" (THM-SOC-110).
        Made sure "V" field is carried through data (otherwise it crashes
          THM_CAL_EFI.PRO), redined suffix to "_dsl" (effectively true), fixed
          potential bitwise vs. logical conditional bug, updated doc'n, WMF,
          3/21/2008 (F).
        Put in return on errors w/ messages for DLIMITS.DATA_ATT.COORD_SYS equal
          to 'dsl' or 'spg', set said field to 'dsl' on conclusion of
          processing, updat'd doc'n, WMF, 3/24/2008.
        Checks validity of pointer from SPINMODEL_GET_PTR.PRO and calls
          THM_LOAD_SPIN,PROBE=PROBE[0] on fail, installed an alternate test for
          spinmodel data (TNAMES('th?_spin*')) to check an error from
          SPINMODEL_INTERP_T.PRO but the error is unrelated, WMF, 3/26/2008.
        Removed check on pointer in favor of incorporating THM_LOAD_SPIN.PRO into
          THM_LOAD_STATE.PRO, WMF, 3/27/2008.
        Updated doc'n, WMF, 3/27/2008.
        Changed "Despinning <variable>" PRINT to MESSAGE, if data already despun
          save TPLOT var. instead of just returning (BugzID 111), WMF, 4/4/08 (F).
        Disabled BOOM_OFFSET parameter which is obsolete, WMF, 4/22/2008 (Tu).
        Upd'd doc'n, WMF, 5/21/2008.
        Change (spin-dependent) offset parameter to optional kw OFFSET.  Subtract OFFSET only if provided and only if there are 2 spin-dependent
          offsets in boom plane, WMF, 3/2/2009.
        Return OFFSET to a parameter: Subtract X, Y, Z for 2 spin-dependent offsets in boom plane; subtract Z only for 4 spin-dependent offsets, WMF, 3/5/09.

     $LastChangedBy: michf $
     $LastChangedDate: 2008-05-15 11:17:41 -0700 (Thu, 15 May 2008) $
     $LastChangedRevision: 3095 $
     $URL: $

(See projects/themis/spacecraft/fields/thm_efi_despin.pro)

## THM_EFI_SDT_TEST[1]

[Previous Routine] [Next Routine] [List of Routines]

     Returns the start and end indices of intervals where a condition
     applies

(See projects/themis/spacecraft/fields/thm_efi_sdt_test.pro)

## THM_EFI_SDT_TEST[2]

[Previous Routine] [Next Routine] [List of Routines]

    NAME:
    thm_efi_sdt_test
    PURPOSE:
    Checks houesekeeping data to flag the presence of EFI SDT (Sensor
    Diagnostic Tests).
    CALLING SEQUENCE:
    thm_efi_sdt_test, probe=probe, trange=trange
    INPUT:
    All via keyword
    OUTPUT:
    None explicit, instead the program creates a tplot variable with an
    sdt_flag for each HSK data point, 'th?_efi_sdt_flag' is set to 1, if
    there is an SDT.
    KEYWORDS:
    probe = The default is: ['a', 'b', 'c', 'd', 'e']
    trange  = (Optional) Time range of interest  (2 element array), if
    this is not set, the default is to use any timespan that has been
    previously set, and then to prompt the user. Note that if the input
    time range is not a full day, a full day's data is loaded
    textend = the extension time for the data, in seconds. Sdt's typically last
    for 2.5 hours, so the input time range is by default extended by 3
    hours. the keyword textend can be used to change this.
    min_dt = the minimum duration for an SDT, default is 20 minutes (1200
    seconds).
    HISTORY:
     2014-10-13, jmm, jimm@ssl.berkeley.edu
     $LastChangedBy: nikos $
     $LastChangedDate: 2018-01-31 12:01:53 -0800 (Wed, 31 Jan 2018) $
     $LastChangedRevision: 24613 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/thm_efi_sdt_test.pro $

(See projects/themis/spacecraft/fields/thm_efi_sdt_test.pro)

## THM_FBK_DECOMPRESS

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    Function: THM_FBK_DECOMPRESS

    Purpose:  Decompresses DFB FBK spectral data.
    Arguements:
    	DATA, any BYTE data type (scalar or array), 8-bit compressed FBK band-pass amplitude estimates.
    keywords:
       VERBOSE.
    Example:
       result = thm_fbk_compress( data)

    Notes:
    	-- none.

     $LastChangedBy: jimm $
     $LastChangedDate: 2007-11-16 12:28:13 -0800 (Fri, 16 Nov 2007) $
     $LastChangedRevision: 2043 $
     $URL $

(See projects/themis/spacecraft/fields/thm_fbk_decompress.pro)

## THM_FFT_DECOMPRESS

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    Function: THM_FFT_DECOMPRESS

    Purpose:  Decompresses DFB FFT spectral data.
    Arguements:
    	DATA, any BYTE data type (scalar or array), 8-bit compressed FFT spectral estimates.
    keywords:
       VERBOSE.
    Example:
       result = thm_fft_compress( data)

    Notes:
    	-- Stub version, to allow for testing.

     $LastChangedBy: jimm $
     $LastChangedDate: 2007-11-16 12:28:13 -0800 (Fri, 16 Nov 2007) $
     $LastChangedRevision: 2043 $
     $URL $

(See projects/themis/spacecraft/fields/thm_fft_decompress.pro)

## THM_FFT_FREQ_BINS[1]

[Previous Routine] [Next Routine] [List of Routines]

      thm_fft_freq_bins

(See projects/themis/spacecraft/fields/thm_fft_freq_bins.pro)

## THM_FFT_FREQ_BINS[2]

[Previous Routine] [Next Routine] [List of Routines]

    	Procedure:
    		thm_fft_freq_bins

    	Purpose:
    		Given the sampling rate and number of bins, return the center frequencies
    	of the FFT spectral estimate bins.

    	Calling Sequence:
    	thm_fft_freq_bins, rate=rate, nbins=nbins, cent_freq=cent_freq

    	Arguements:
    		rate	STRING, '8k' or '16k', indicating that the source sampling rate is 8192 or 16384 samp/s.
    		nbins	INT, 16, 32, or 64; number of frequency bins in the FFT spectral estimate.

    	Outputs:
    		cent_freq	FLOAT[ nbins], center frequencies of bins in Hz.

    	Notes:
    	-- none.

     $LastChangedBy: aaflores $
     $LastChangedDate: 2012-01-26 16:43:03 -0800 (Thu, 26 Jan 2012) $
     $LastChangedRevision: 9624 $
     $URL $

(See projects/themis/spacecraft/fields/thm_fft_freq_bins.pro)

## THM_FGM_FIND_SHIFT_1P1C

[Previous Routine] [Next Routine] [List of Routines]

     Function: thm_fgm_find_shift_1p1c

     Description:       Returns the vector to be added to l1 data to correct
    	             the '390 nT' jumps for one probe and one component.

     Input:

       b =              the uncorrected measurements

       threshold =      threshold matrix (probe x component). A jump occurs when the field
                        crosses this value. Note that the actual threshold depends on the
                        field derivative. The value given here is for constant field (th0).

       th_slope =       slope of the threshold: threshold=th0+th_slope*(db/dt)

       jump =           jump matrix (probe x component). The expected values of the jumps.

       datatype=        'fgl' or        -> low resolution   (4Hz)
                        'fgh' or        -> high resolution  (128 Hz)
                        'fge'           -> engeneering data (8 Hz)

     Keywords:

       /fixed:          take the correction from the jump matrix. Default for fgh
                        is to  compute the correction for each jump such  way that
                        the first derivative is constant across the jump from low
                        to high values. It has no effect for fge or fgl data for
                        which the correction is taken by default from the jump
                        matrix.

       /constant:       average the correction over all jumps for fgh. It has no
                        effect for fge or fgl.

     Return value:      the correction vector

     Example:

      corr = thm_fgm_find_shift_1p1c(b, th_up, th_dn, jump, /constant, datatype='fgh')

     Notes
    	- this function is used by fgm_find_shift

     Written by Dragos Constantinescu

     Minor modifications by Patrick Cruce for incorporation into TDAS.
     Specifically:
        1. Changed Function Name
        2. Disabled output of statistics to file.

    $LastChangedBy: nikos $
    $LastChangedDate: 2015-09-16 10:41:52 -0700 (Wed, 16 Sep 2015) $
    $LastChangedRevision: 18806 $
    $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/thm_fgm_find_shift_1p1c.pro $

(See projects/themis/spacecraft/fields/thm_fgm_find_shift_1p1c.pro)

## THM_FGS_SPIKE_CORRECTIONS

[Previous Routine] [Next Routine] [List of Routines]

     Name:
         thm_fgs_spike_corrections

     Purpose:
         Routines for searching for and correcting various issues with the FGS data, including:
                 1) off-by-one spin errors where data points have been skipped
                 2) jumps in a packet at range changes
                 3) jumps in a packet at eclipse starts/stops

         These problems are obvious when plotting FGS dBz/dt when the spacecraft is near perigee,
         though they can also occur during low fields

     Example:
       thm_fgs_spike_corrections, time_start='2010-09-01/00:00:00', duration=30, probes=['a'], eclipse_tolerance=300, filename="c:\temp\test.txt"

     $LastChangedBy: nikos $
     $LastChangedDate: 2015-02-18 16:03:44 -0800 (Wed, 18 Feb 2015) $
     $LastChangedRevision: 17003 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/thm_fgs_spike_corrections.pro $

(See projects/themis/spacecraft/fields/thm_fgs_spike_corrections.pro)

## THM_GET_EFI_CAL_PARS

[Previous Routine] [Next Routine] [List of Routines]

    	Procedure:
    				thm_get_efi_cal_pars

    	Purpose:
    				Given the particular EFI waveform data type, and begin and end of the time interval, return the waveform RAW->PHYS
    				transformation parameters.

    	Calling Sequence:
    				thm_get_efi_cal_pars, times, name, probes, cal_pars=cal_pars

    	Arguements:
    		TIMES: 		Input, DOUBLE, time basis of data since THEMIS epoch.
    		NAME:		Input, STRING, waveform data type indicator.
                   PROBES: 	Input, SCALAR STRING, name of THEMIS probe (i.e., only one probe -- 'a','b',...).

           Keywords:
                   CAL_PARS: 	Output, STRUCT, see Notes below for elements.
                   /TEST: 		Input, numeric, 0 or 1.  Disables selected /CONTINUE to MESSAGE.  For QA testing.

    Modifications:
      Added FILE_RETRIEVE() mechanism so that this routine can read the
        template and calibration files from the THEMIS local data directory.
        Also, added the "probes" parameter for the above purpose,
        W.M.Feuerstein, 2/27/2008.
      Changed "History" to "Modifications" in header, commented out all local
        calibration parameters, redifined ASCII template, now retrieving all
        calibration parameters from calibration files (these were expanded last
        Friday).  Updated doc'n, WMF, 3/17/08.
      Implemented EAC/EDC gain conditional based on 1st element of TH?_EF?_HED_AC
        tplot variable, updated doc'n, WMF, 3/18/08.
      Inserted modern compile options, made ADC offsets integers in calibration
        files, updated read templates, WMF, 3/20/08.
      Fixed potential logical vs. bitwise conditional bug, updated calibration
        fields, WMF, 3/21/2008.
      Preparing for time-dependent calibration params. and AC/DC coupling gain
        conditional -- code still commented, WMF, 4/4/2008 (F).
      Replaced PRINT w/ MESSAGE for EAC/DC gain conditional warning. Added TEST kw
        (default = 0) to disable CONTINUE kw to selected MESSAGE commands.  If a
        non-EFI datatype is passed then routine will stop, WMF, 4/7/2008 (M).
      Fixed typo "Defaulting to EAC gain"=>"...EDC...", rephrased, WMF,
        4/9/2008 (W).
      Reformatted, WMF, 4/10/2008 (Th).
      Corrected an error to assigning the field gain to the output structure --
        would only affect AC coupled data, WMF, 4/11/2008.
      Implemented time-dependent EAC/EDC gain conditional, WMF, 4/22/2008 (Tu).
      Removed "[0]" in some of the CP structure fields (moving to T-D calibration
        parameters), clipping CAL_PAR_TIME to TIMES, WMF, 4/23/2008 (W).
      Added 'efs' datatype to switch statement, WMF, 5/12/2008 (M).
      Stripped out time-dependent EAC/EDC gain conditional handling and moved to
        THM_CAL_EFI.PRO.  Also, now passing EAC_GAIN and EDC_GAIN instead of
        just GAIN for the e?? datatype, WMF, 5/21 - 6/5/2008.
      Fixed crash on reading calibration files with only one line of data, WMF, 8/6/2008.
      Renamed from "thm_get_efi_cal_pars_td.pro" to "thm_get_efi_cal_pars.pro", WMF, 9/9/2008.

    	Notes:
    	-- use of TBEG and TEND for time-dependent calibration parameters is not currently implemented!
    	-- Difference in gain between DC and AC coupled E-field data implemented, but not calibrated yet (as of 6/18/2009)!
    	-- Elements of CAL_PARS are picked and chosen from the pertinent calibration file depending on NAME.  See switch statement in code.

     $LastChangedBy: michf $
     $LastChangedDate: 2008-05-15 11:17:41 -0700 (Thu, 15 May 2008) $
     $LastChangedRevision: 3095 $
     $URL $

(See projects/themis/spacecraft/fields/thm_get_efi_cal_pars.pro)

## THM_GET_EFI_CAL_PARS_NONTD

[Previous Routine] [Next Routine] [List of Routines]

     Deprecated, 2012-06-08, jmm

     $LastChangedBy: jimm $
     $LastChangedDate: 2012-06-08 14:44:13 -0700 (Fri, 08 Jun 2012) $
     $LastChangedRevision: 10523 $
     $URL $

(See projects/themis/spacecraft/fields/thm_get_efi_cal_pars_nonTD.pro)

## THM_GET_FBK_CAL_PARS

[Previous Routine] [Next Routine] [List of Routines]

    	Procedure:
    		thm_get_fbk_cal_pars

    	Purpose:
    		Given the signal source, and begin and end of the time interval,
    	return the filter bank RAW->PHYS transformation parameters.

    	Calling Sequence:
    	thm_get_fbk_cal_pars, tbeg, tend, fb_sel, cal_pars=cal_pars

    	Arguements:
    		tbeg, tend	DOUBLE, time in seconds since THEMIS epoch.
    		fb_sel	INT, FilterBank source selection indicator.
    		cal_pars	STRUCT, see Notes below for elements.

    	Notes:
    	-- use of TBEG and TEND for time-dependent calibration parameters is not currently implemented!
    	-- E-field gains and units are for voltages, not fields, since we have not deployed yet!
    	-- Elements of cal_pars are as follows:
    		gain,	FLOAT, gain of source channel at 0 dB response in (phys unit)/ADC.
    		freq_resp FLOAT[ 6], effective attenuation factor for source channel for each
    			of the six FilterBank channels.

     $LastChangedBy: jimm $
     $LastChangedDate: 2007-11-16 12:28:13 -0800 (Fri, 16 Nov 2007) $
     $LastChangedRevision: 2043 $
     $URL $

(See projects/themis/spacecraft/fields/thm_get_fbk_cal_pars.pro)

## THM_GET_FFT_CAL_PARS

[Previous Routine] [Next Routine] [List of Routines]

    	Procedure:
    		thm_get_fft_cal_pars

    	Purpose:
    		Given the signal source, and begin and end of the time interval,
    	return the FFT RAW->PHYS transformation parameters.

    	Calling Sequence:
    	thm_get_fft_cal_pars, tbeg, tend, fft_sel, nbins, cal_pars=cal_pars

    	Arguements:
    		tbeg, tend	DOUBLE, time in seconds since THEMIS epoch.
    		fft_sel	INT, FilterBank source selection indicator.
    		nbins,	INT, number of frequency bins in spectrum (16, 32, 64).
    		cal_pars	STRUCT, see Notes below for elements.

    	Notes:
    	-- use of TBEG and TEND for time-dependent calibration parameters is not currently implemented!
    	-- E-field gains and units are for actual deployed boom lengths (CDE).
    	-- Elements of cal_pars are as follows:

     $LastChangedBy: jimm $
     $LastChangedDate: 2007-11-16 12:28:13 -0800 (Fri, 16 Nov 2007) $
     $LastChangedRevision: 2043 $
     $URL $

(See projects/themis/spacecraft/fields/thm_get_fft_cal_pars.pro)

## THM_L1B_CHECK

[Previous Routine] [Next Routine] [List of Routines]

    NAME:
    thm_l1b_check
    PURPOSE:
    Tests for L1B (Estimated spin-axis Bz from spin-plane components),
    FGM data. Currently (as of 2025-01-28) used only for THEMIS E, post
    2024-05-25
    CALLING SEQUENCE:
    file = thm_l1b_check(date, probe)
    INPUT:
    date = date for data check
    probe = probe (currently only 'e' will give a non-blank answer)
    OUTPUT:
    file = L1B file with data for the given day, full path
    HISTORY:
    hacked from THM_L2GEN_FGM, 2025-01-25, jmm, jimm@ssl.berkeley.edu
     $LastChangedBy: $
     $LastChangedDate: $
     $LastChangedRevision: $
     $URL: $

(See projects/themis/spacecraft/fields/thm_l1b_check.pro)

## THM_LOAD_EFI

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    Procedure: THM_LOAD_EFI

    Purpose:  Loads THEMIS EFI data

    Syntax:  THM_LOAD_EFI [, <optional keywords below> ]

    keywords:
      PROBE:		Input, string.  Specify space-separated probe letters, or string array (e.g., 'a c', ['a', 'c']).  Defaults to all probes.
      DATATYPE:		Input, string.  Default setting is to calibrate all raw quantites and also produce all _0 and _dot0 quantities.  Use DATATYPE
                           kw to narrow the data products.  Wildcards and glob-style patterns accepted (e.g., ef?, *_dot0).
      SUFFIX:		Input, scalar or array string.  Set (scalar) to append SUFFIX to all output TPLOT variable names.  Set (array with same # elements
    			as COORD) to put suffixes for corresponding COORD elements (one TPLOT variable with suffix for each element of COORD).  When COORD has
    			> 1 element, SUFFIX must have the same # of elements (or be unset).
      TRANGE:		Input, double (2 element array).  Time range of interest.  If this is not set, the default is to prompt the user.  Note that if the
    			input time range is not a full day, a full day's data is loaded.
      LEVEL:		I/O, string.  The level of the data, the default is 'l1', or level-1 data. A string (e.g., 'l2') or an integer can be used. Only
    			one level can be specifed at a time.  Set /VALID_NAMES to return the valid level names.
      CDF_DATA:		Output, string.  Named variable in which to return cdf data structure: only works for a single spacecraft and datafile name.
      VARNAMES:		*** CDF_DATA must be present ***  Output, string.  Returns CDF variable names that were loaded.
      /GET_SUPPORT_DATA: 	Input, numeric, 0 or 1.  Set to load support_data variables as well as data variables into tplot variables.
      /DOWNLOADONLY:	Input, numeric, 0 or 1.  Set to download file but not read it.
      /VALID_NAMES:	Input, numeric, 0 or 1.  If set, then this routine will return the valid probe, datatype and/or level options in named variables
    			supplied as arguments to the corresponding keywords.
      FILES:		Output, string.  Named varible for output of pathnames of local files.
      /VERBOSE:		Input, numeric, 0 or 1.  Set to output some useful info.
      /NO_DOWNLOAD:	Input, numeric, 0 or 1.  Set to use only files which are online locally.
      RELPATHNAMES_ALL:	Output, string.  Named variable in which to return all files that are required for specified timespan, probe, datatype, and level.  If
    			present, no files will be downloaded, and no data will be loaded.
      TYPE:		Input, string.  Set to 'calibrated' or 'raw'.
      COORD:		Input, string.  What coordinate system you would like your data in.  For choices, see THEMIS Sci. Data Anal. Software Users Guide.
      TEST:		Input, numeric, 0 or 1.  Disables selected /CONTINUE to MESSAGE.  For QA testing only.
      /NO_TIME_CLIP:       Disables time clipping, which is the default
     use_eclipse_corrections:  Only applies when loading and calibrating
       Level 1 data. Defaults to 0 (no eclipse spin model corrections
       applied).  use_eclipse_corrections=1 applies partial eclipse
       corrections (not recommended, used only for internal SOC processing).
       use_eclipse_corrections=2 applies all available eclipse corrections.
       ONTHEFLY_EDC_OFFSET:OUTPUT, float.  Return the EDC offset array
                           calculated on-the-fly in a structure (tag name = probe letter,
                           subtagname =datatype).  *** WARNING: This kw can use a lot
                           of memory, if processing many datatypes, or long time periods. ***

    Example:
       thg_load_efi,/get_suppport_data,probe=['a', 'b']
    Notes:

    Modifications:
      Added TEST kw to disable certain /CONTINUE to MESSAGE, and passed TEST
        through to THM_CAL_EFI.PRO, W.M.Feuerstein, 4/7/2008 (M).
      Fixed crash on passing an argument for RELPATHNAMES_ALL, WMF, 4/9/2008 (Tu).
      Added _extra keyword to ease the passing of keywords to thm_cal_efi
     $LastChangedBy: jimm $
     $LastChangedDate: 2025-05-08 11:29:53 -0700 (Thu, 08 May 2025) $
     $LastChangedRevision: 33301 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/thm_load_efi.pro $

(See projects/themis/spacecraft/fields/thm_load_efi.pro)

## THM_LOAD_EFI_L2

[Previous Routine] [Next Routine] [List of Routines]

    Procedure: THM_LOAD_EFI_l2

    Purpose:  Loads THEMIS EFI level 2 data

    Syntax:  THM_LOAD_EFI [, <optional keywords below> ]

    keywords:
      PROBE:		Input, string.  Specify space-separated probe
      letters, or string array (e.g., 'a c', ['a', 'c']).  Defaults to
      all probes.
      DATATYPE:		Input, string.  Default setting is to load
      quantities.  Use DATATYPE kw to narrow the data products.
      Wildcards and glob-style patterns accepted (e.g., ef?, *_dot0).
      SUFFIX:		Input, scalar or array string.  Set (scalar)
      to append SUFFIX to all output TPLOT variable names.  Set (array
      with same # elements	as COORD) to put suffixes for corresponding
      COORD elements (one TPLOT variable with suffix for each element of
      COORD).  When COORD has > 1 element, SUFFIX must have the same # of
      elements (or be unset).
      TRANGE:		Input, double (2 element array).  Time range
      of interest.  If this is not set, the default is to prompt the
      user.  Note that if the input time range is not a full day, a full
      day's data is loaded.
      /DOWNLOADONLY:	Input, numeric, 0 or 1.  Set to download file
      but not read it.
      /VALID_NAMES:	Input, numeric, 0 or 1.  If set, then this
      routine will return the valid probe, datatype and/or level options
      in named variables supplied as arguments to the corresponding
      keywords.
      FILES:		Output, string.  Named varible for output of
      pathnames of local files.
      /VERBOSE:		Input, numeric, 0 or 1.  Set to output some
      useful info.
      /NO_DOWNLOAD:	Input, numeric, 0 or 1.  Set to use only files
      which are online locally.
      RELPATHNAMES_ALL:	Output, string.  Named variable in which to
      return all files that are required for specified timespan, probe,
      datatype, and level.  If present, no files will be downloaded, and
      no data will be loaded.
      COORD:		Input, string.  What coordinate system you
      would like your data in.  For choices, see THEMIS Sci. Data
      Anal. Software Users Guide.
      TEST:		Input, numeric, 0 or 1.  Disables selected
      /CONTINUE to MESSAGE.  For QA testing only.
      /NO_TIME_CLIP:       Disables time clipping, which is the default
    Example:
       thg_load_efi,/get_suppport_data,probe=['a', 'b']
    Notes:

    Modifications:
      Added TEST kw to disable certain /CONTINUE to MESSAGE, and passed TEST
        through to THM_CAL_EFI.PRO, W.M.Feuerstein, 4/7/2008 (M).
      Fixed crash on passing an argument for RELPATHNAMES_ALL, WMF, 4/9/2008 (Tu).

     $LastChangedBy: jwl $
     $LastChangedDate: 2025-07-22 16:45:29 -0700 (Tue, 22 Jul 2025) $
     $LastChangedRevision: 33486 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/thm_load_efi_l2.pro $

(See projects/themis/spacecraft/fields/thm_load_efi_l2.pro)

## THM_LOAD_FBK

[Previous Routine] [Next Routine] [List of Routines]

    Procedure: THM_LOAD_FBK

    Purpose:  Loads THEMIS FilterBank data

    keywords:
      probe = Probe name. The default is 'all', i.e., load all available probes.
              This can be an array of strings, e.g., ['a', 'b'] or a
              single string delimited by spaces, e.g., 'a b'
      datatype = The type of data to be loaded, can be an array of strings
              or single string separate by spaces.  The default is 'all'
      TRANGE= (Optional) Time range of interest  (2 element array), if
              this is not set, the default is to prompt the user. Note
              that if the input time range is not a full day, a full
              day's data is loaded
      level = the level of the data, the default is 'l1', or level-1
              data. A string (e.g., 'l2') or an integer can be used. 'all'
              can be passed in also, to get all levels.
      type=   'raw' or 'calibrated'. default is calibrated.
      suffix= suffix to add to output data quantity
      relpathnames_all: named variable in which to return all files that are
              required for specified timespan, probe, datatype, and level.
              If present, no files will be downloaded, and no data will be loaded.
              and/or level options in named variables supplied as
              arguments to the corresponding keywords.
      files   named varible for output of pathnames of local files.
      CDF_DATA: named variable in which to return cdf data structure: only works
              for a single spacecraft and datafile name.
      VARNAMES: names of variables to load from cdf: default is all.
      /GET_SUPPORT_DATA: load support_data variables as well as data variables
                          into tplot variables.
      /DOWNLOADONLY: download file but don't read it.
      /VALID_NAMES, if set, then this routine will return the valid
      probe, datatype
      /NO_DOWNLOAD: use only files which are online locally.
      /VERBOSE  set to output some useful info
      /NO_TIME_CLIP: Disables time clipping, which is the default
    Example:
       thg_load_fbk,/get_suppport_data,probe=['a', 'b']
    Notes:
     Added the new frequency center values, 24-oct-2008, jmm, jimm@ssl.berkeley.edu
     $LastChangedBy: nikos $
     $LastChangedDate: 2016-11-16 15:45:58 -0800 (Wed, 16 Nov 2016) $
     $LastChangedRevision: 22364 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/thm_load_fbk.pro $

(See projects/themis/spacecraft/fields/thm_load_fbk.pro)

## THM_LOAD_FFT

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    Procedure: THM_LOAD_FFT

    Purpose:  Loads THEMIS FFT spectra (ParticleBurst and WaveBurst) data

    keywords:
      probe = Probe name. The default is 'all', i.e., load all available probes.
              This can be an array of strings, e.g., ['a', 'b'] or a
              single string delimited by spaces, e.g., 'a b'
      datatype = The type of data to be loaded, can be an array of strings
              or single string separate by spaces.  The default is 'all'
      TRANGE= (Optional) Time range of interest  (2 element array), if
              this is not set, the default is to prompt the user. Note
              that if the input time range is not a full day, a full
              day's data is loaded
      level = the level of the data, the default is 'l1', or level-1
              data. A string (e.g., 'l2') or an integer can be used. 'all'
              can be passed in also, to get all levels.
      type=   'raw' or 'calibrated'. default is calibrated.
      suffix= suffix to add to output data quantity (not added to support
      data)
      relpathnames_all: named variable in which to return all files that are
              required for specified timespan, probe, datatype, and level.
              If present, no files will be downloaded, and no data will be loaded.
      files   named varible for output of pathnames of local files.
      CDF_DATA: named variable in which to return cdf data structure: only works
              for a single spacecraft and datafile name.
      VARNAMES: names of variables to load from cdf: default is all.
      /GET_SUPPORT_DATA: load support_data variables as well as data variables
                          into tplot variables.
      /DOWNLOADONLY: download file but don't read it.
      /VALID_NAMES: if set, then this routine will return the valid
      probe, datatype and/or level options in named variables supplied as
      arguments to the corresponding keywords.
      /NO_DOWNLOAD: use only files which are online locally.
      /VERBOSE  set to output some useful info
      /NO_TIME_CLIP: Disables time clipping, which is the default
    Example:
       thm_load_fft,/get_suppport_data,probe=['a', 'b']
    Notes:

     $LastChangedBy: nikos $
     $LastChangedDate: 2016-11-16 15:45:58 -0800 (Wed, 16 Nov 2016) $
     $LastChangedRevision: 22364 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/thm_load_fft.pro $

(See projects/themis/spacecraft/fields/thm_load_fft.pro)

## THM_LOAD_FGM

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    Procedure: THM_LOAD_FGM

    Purpose:  Loads THEMIS fluxgate magnetometer data

    keywords:
      probe = Probe name. The default is 'all', i.e., load all available probes.
              This can be an array of strings, e.g., ['a', 'b'] or a
              single string delimited by spaces, e.g., 'a b'
      datatype = The type of data to be loaded, 'fge', 'fgh', or 'fgl'.  'all'
              can be passed in also, to get all variables.
      TRANGE= (Optional) Time range of interest  (2 element array), if
              this is not set, the default is to prompt the user. Note
              that if the input time range is not a full day, a full
              day's data is loaded
      level = the level of the data to read, the default is 'l1', or level-1
              data. A string (e.g., 'l2') or an integer can be used. 'all'
              can be passed in also, to get all levels.
      type=   'raw' or 'calibrated'. default is calibrated.
      coord=  coordinate system of output.  default is 'dsl'
      suffix= suffix to add to output data quantity (not added to support data)
      CDF_DATA: named variable in which to return cdf data structure: only works
              for a single spacecraft and datafile name.
      VARNAMES: names of variables to load from cdf: default is all.
      /GET_SUPPORT_DATA: load support_data variables as well as data variables
              into tplot variables.
      /DOWNLOADONLY: download file but don't read it.
      /no_download: use only files which are online locally.
      relpathnames_all: named variable in which to return all files that are
              required for specified timespan, probe, datatype, and level.
              If present, no files will be downloaded, and no data will be loaded.
      /valid_names, if set, then this routine will return the valid probe, datatype
              and/or level options in named variables supplied as
              arguments to the corresponding keywords.
      files   named varible for output of pathnames of local files.
      /VERBOSE  set to output some useful info, set to 0 to or 1 to reduce output.
      /NO_TIME_CLIP: Disables time clipping, which is the default
     use_eclipse_corrections:  Only applies when loading and calibrating
       Level 1 data. Defaults to 0 (no eclipse spin model corrections
       applied).  use_eclipse_corrections=1 applies partial eclipse
       corrections (not recommended, used only for internal SOC processing).
       use_eclipse_corrections=2 applies all available eclipse corrections.

      NOTE: The following keywords are only used if level=1 is set
      cal_dac_offset = apply calibrations that remove digital analog
                       converter nonlinearity by addition of offset.
                       Algorithm generated by Dragos Constantine
                       <d.constantinescu@tu-bs.de>. This is the default
                       process as of 7-Jan-2010, to disable, explicitly
                       set this keyword to 0.
      cal_spin_harmonics = apply calibrations from a file that remove
                           spin harmonics by applying spin-dependent
                           offsets generated by David Fischer
                           <david.fischer@oeaw.ac.at>. This is the default
                           process as of 7-Jan-2010, to disable, explicitly
                           set this keyword to 0.
      cal_tone_removal = fitting algorithm removes orbit dependent
                         spintone without removing scientifically salient
                         features. Algorithm generated by Ferdinand Plaschke
                         <f.plaschke@tu-bs.de>. This is the default
                         process as of 7-Jan-2010, to disable, explicitly
                         set this keyword to 0.
      cal_get_fulloffset = returns the offset used for spintone removal.(this keyword used for valididation)
                           Because there may be a different offset for each combination of probe and datatype,
                           This is returned as a struct of structs, with each element in the child structs being an N by 3 array.
                           For example, if offset_struct is the name of a struct with the return value from the cal_get_fulloffset keyword,
                             print,offset_struct.tha.fgl
                           Will print the fulloffset for probe a and datatype fgl.
      cal_get_dac_dat = Returns the raw data from directly after the DAC(non-linearity offset) calibration is applied.  For verification.
      cal_get_spin_dat = Returns the raw data from directly after the spin harmonic(solar array current) calibration is applied.  For verification.
      interpolate_cal = if it is set, then thm_cal values are interpolated to 10 min time intervals
     check_l1b: if set, then look for L1B data files that include
                estimates for Bz. This is the deafult for THEMIS E
                after 2024-06-01 (date subject to change....)

    Example:
       thg_load_fgm,probe=['a','b']
    Notes:
      This routine is (should be) platform independent.

     $LastChangedBy: jimm $
     $LastChangedDate: 2024-11-20 11:24:00 -0800 (Wed, 20 Nov 2024) $
     $LastChangedRevision: 32968 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/thm_load_fgm.pro $

(See projects/themis/spacecraft/fields/thm_load_fgm.pro)

## THM_LOAD_FIT

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    Procedure: THM_LOAD_FIT

    Purpose:  Loads THEMIS FIT data

    keywords:
      probe = Probe name. The default is 'all', i.e., load all available probes.
              This can be an array of strings, e.g., ['a', 'b'] or a
              single string delimited by spaces, e.g., 'a b'
      datatype = The type of data to be loaded, can be an array of strings
              or single string separate by spaces.  The default is 'all'
      TRANGE= (Optional) Time range of interest  (2 element array), if
              this is not set, the default is to prompt the user. Note
              that if the input time range is not a full day, a full
              day's data is loaded
      level = the level of the data, the default is 'l1', or level-1
              data. A string (e.g., 'l2') or an integer can be used. 'all'
              can be passed in also, to get all levels.
      CDF_DATA: named variable in which to return cdf data structure: only works
              for a single spacecraft and datafile name.
      VARNAMES: names of variables to load from cdf: default is all.
      /GET_SUPPORT_DATA: load support_data variables as well as data variables
                          into tplot variables.
      /DOWNLOADONLY: download file but don't read it.
      /valid_names, if set, then this routine will return the valid probe, datatype
              and/or level options in named variables supplied as
              arguments to the corresponding keywords.
      files   named varible for output of pathnames of local files.
      /no_cal if set will not include boom shortening or Ex offset in output
      /VERBOSE  set to output some useful info
      /NO_TIME_CLIP: Disables time clipping, which is the default
     use_eclipse_corrections:  Only applies when loading and calibrating
       Level 1 data. Defaults to 0 (no eclipse spin model corrections
       applied).  use_eclipse_corrections=1 applies partial eclipse
       corrections (not recommended, used only for internal SOC processing).
       use_eclipse_corrections=2 applies all available eclipse corrections.
     check_l1b: if set, then look for L1B data files that include
                estimates for Bz. This is the deafult for THEMIS E
                after 2024-06-01 (date subject to change....)

    Example:
       thg_load_fit,/get_suppport_data,probe=['a', 'b']
    Modifications:
      J. McFadden passed through the NO_CAL kw to THM_CAL_FIT.PRO, WMF, 6/27/2008.
    Notes:

     $LastChangedBy: jimm $
     $LastChangedDate: 2024-11-20 11:24:00 -0800 (Wed, 20 Nov 2024) $
     $LastChangedRevision: 32968 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/thm_load_fit.pro $

(See projects/themis/spacecraft/fields/thm_load_fit.pro)

## THM_LOAD_SCM

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    Procedure: THM_LOAD_SCM

    Purpose:  Loads THEMIS SCM data

    keywords:
      probe = Probe name. The default is 'all', i.e., load all available probes.
              This can be an array of strings, e.g., ['a', 'b'] or a
              single string delimited by spaces, e.g., 'a b'
      datatype = The type of data to be loaded, can be an array of strings
              or single string separate by spaces.  The default is 'all'
      TRANGE= (Optional) Time range of interest  (2 element array), if
              this is not set, the default is to prompt the user. Note
              that if the input time range is not a full day, a full
              day's data is loaded
      level = the level of the data, the default is 'l1', or level-1
              data. A string (e.g., 'l2') or an integer can be used. 'all'
              can be passed in also, to get all levels.
      CDF_DATA: named variable in which to return cdf data structure: only works
              for a single spacecraft and datafile name.
      VARNAMES: names of variables to load from cdf: default is all.
      /GET_SUPPORT_DATA: load support_data variables as well as data variables
                          into tplot variables.
      /DOWNLOADONLY: download file but don't read it.
      /no_download: use only files which are online locally.
      relpathnames_all: named variable in which to return all files that are
              required for specified timespan, probe, datatype, and level.
              If present, no files will be downloaded, and no data will be loaded.
      /valid_names, if set, then this routine will return the valid probe, datatype
              and/or level options in named variables supplied as
              arguments to the corresponding keywords.
      files   named varible for output of pathnames of local files.
      /VERBOSE  set to output some useful info, set to 0 to or 1 to reduce output.
      CLEANUP: Pass through to THM_CAL_SCM.PRO.
      SCM_CAL: Structure containing the calibration parameters
      /NO_TIME_CLIP: Disables time clipping, which is the default
      TYPE: Input, string.  Set to 'calibrated' or 'raw'.

     use_eclipse_corrections:  Only applies when loading and calibrating
       Level 1 data. Defaults to 0 (no eclipse spin model corrections
       applied).  use_eclipse_corrections=1 applies partial eclipse
       corrections (not recommended, used only for internal SOC processing).
       use_eclipse_corrections=2 applies all available eclipse corrections.

    KEYWORDS FOR CALIBRATION PROCESS: These are passed through to the
    THM_SCM_CAL procedure:
      in_suffix =  optional suffix to add to name of input data quantity, which
              is generated from probe and datatype keywords.
      out_suffix = optional suffix to add to name for output tplot quantity,
              which is generated from probe and datatype keywords.
      trange= array[2] string or double.  Limit calibration to specified time range

      nk =    N points of the cal-convolution kernel, if set, this value will
              be used regardless of sample rate.
      mk =    If nk is not set, set nk to (sample frequency)*mk, where sample
              frequency is determined by the data. default 8 for scf, 4 for scp,
              and 1 for scw.
      despin =classic despin algorithm. 0:off 1:on  Default is on.
      n_spinfit=n spins to fit for misalignment, dc field calculation and
                 optionally despin.
      cleanup= type of cleanup (default is 'none'):
              'spin' for only spin tones (power ripples) cleanup,
              'full' for spin tones and 8/32 Hz tones
              'none' for no cleanup processes.
      wind_dur_1s = window duration for 8/32 Hz cleanup (has to be a multiple of 1s)
              default is 1.
      wind_dur_spin = spintone cleanup window duration as a multiple of the spin
              period. Default is 1.
      clnup_author = choice of cleanup routine (default is 'ole'):
              'ccc' to use scm_cleanup_ccc
              'ole' to use spin_tones_cleaning_vector_v5
      fdet =  detrend freq. in Hz.  Detrend is implemented by subtracting a boxcar
              avg., whose length is determined by fdet.
              Use fdet=0 for no detrending.  Default is fdet=0.
      fcut =  Low Frequency cut-off for calibration.  Default is 0.1 Hz.
      fmin =  Min frequency for filtering in DSL system.  Default is 0 Hz.
      fmax =  Max frequency for filtering in DSL system.  Default is Nyquist.
      step =  Highest Processing step to complete.  Default is step 5.
      dfb_butter = correct for DFB Butterworth filter response (defaut is true)
      dfb_dig = correct for DFB Digital fiter response (default is true)
      gainant = correct for antenna gain (default is true)
      blk_con = use fast convolution for calibration and filtering.
              Block size for fast convolution will be equal to
              (value of blk_con) * (size of kernel).  blk_con = 8 by default.
              set blk_con=0 to use brute-force convolution.
      edge_truncate, edge_wrap, edge_zero= Method for handling edges in
              step 3, cal-deconvolution.  For usage and exact specification of
              these keywords, see docs for IDL convol function.  Default is to
              zero data within nk/2 samples of data gap or edge.
      coord = coordinate system of output.  Step 6 output can only be in DSL.
      no_download=don't access internet to check for updated calibration files.
      dircal= If set to a string, specifies directory of calibration files.
              use /dircal or dircal='' to use calibration files in IDL source
              distribution.
    Example:
       thg_load_scm,level=1,/get_suppport_data,probe=['a', 'b']
    Notes:
      This routine is (should be) platform independent.
    Modifications:
      Added CLEANUP kw to pass through to THM_CAL_SCM.PRO, W.Michael Feuerstein,
        4/21/2008.
      30-may-2008 cg, added optional keyword SCM_CAL which is a structure
                      containing all the calibration parameters.
                      modified the call to thm_cal_scm so that parameters
                      can be used.
      23-jul-2008, jmm, added _extra to allow SCM cal keywords to allow
                        cal parameters to be set from the command line,
                        also fixed bug where program would crash when
                        called from the command line. Re-tabbed, to find
                        an 'End of file encountered...' bug.

     $LastChangedBy: jimm $
     $LastChangedDate: 2022-07-27 10:49:09 -0700 (Wed, 27 Jul 2022) $
     $LastChangedRevision: 30962 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/thm_load_scm.pro $

(See projects/themis/spacecraft/fields/thm_load_scm.pro)

## THM_SCM_DECONVO_VEC[1]

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     function thm_scm_fastconvol(a, kernel)
     purpose: a wrapper that gives a unified interface to convol and blk_con -
              Unlike convol, it implements convolution in the mathematical sense
              while centering the kernel over each data point. center is at
              n_elements(k)/2
              Unlike blk_con, it implements centering the kernel and the
              /edge keywords
              Default is to zero the edges within n_elements(k)/2 of the edge.
     parameters:
           a the data (floating point array).
           k the kernel to be convolved with the data (floating point array)
     keywords:
      edge_zero: pad beginning and ending of data with zero
      edge_truncate: pad beginning and ending of data with first/last value
      edge_wrap:  pad beginning and ending of data by wrapping data around edge.
      blk_con: if non-zero, set block size to blk_con times kernel size. if zero
               always use brute-force convolution.  Defaults to 8.
     Author:
        Ken Bromund Sept 18, 2007

     $LastChangedBy: jimm $
     $LastChangedDate: 2012-02-21 12:13:01 -0800 (Tue, 21 Feb 2012) $
     $LastChangedRevision: 9797 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/thm_scm_deconvo_vec.pro $

(See projects/themis/spacecraft/fields/thm_scm_deconvo_vec.pro)

## THM_SCM_DECONVO_VEC[2]

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    Name:
     thm_scm_deconvo_vec
    Purpose:
     continuous calibration accomplished by
     convolveing a signal with a kernel.
     The kernel is derived by taking the fft of the
     inverse of the frequency reponse.  The  kernel is also constructed
     to account for any sample delay.
    Inputs:
        xio: input/output waveform
        nbp: number of points in xio
         nk: number of points in kernel: power of 2.
         f1: low frequency
         f2: high frequency
         fe: sample frequency
    gainant: gain function, such as thm_scm_gainant.  If gainant is an empty
             string, unity gain will be used.
         ix: antenna number (1,2,3)
    pathfil: calibration file name
        tau: time correction
    Keywords:
     edge_truncate
     edge_wrap
     edge_zero     same functionality as keywords of same name to convol()
     blk_con       if non-zero, use block convolution (fast FFT-based convolution)
                   with a block size of the value of this keyword times the kernel
                   size.  If data size is too small, it will revert to
                   brute-force convolution.
     plotk         create diagnostic plots of the kernel and frequency response.

(See projects/themis/spacecraft/fields/thm_scm_deconvo_vec.pro)

## THM_SCM_MODPHA

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     Broken out of thm_scm_gainant_vec.pro for VM purposes, jmm,
     2013-04-23
    $LastChangedBy: jimm $
    $LastChangedDate: 2013-04-23 11:43:46 -0700 (Tue, 23 Apr 2013) $
    $LastChangedRevision: 12137 $
    $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/thm_scm_modpha.pro $

(See projects/themis/spacecraft/fields/thm_scm_modpha.pro)

## THM_SCW_DEGAP

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    NAME:
     thm_scw_degap
    PURPOSE:
     Helper function for thm_cal_scm, this interpolates over short gaps
     in wave burst data, this is the default for L1 SCM data input
     as of 2020-05-18. Previously temp_scw_degap.pro
    INPUT:
     probe = ['a','b','c','d','e']
    KEYWORDS:
     max_degap_dt = maximum size for degap, the default is 0.20 seconds
    HISTORY:
     Originally temp_scw_degap, from 2014, renamed 2020-05-18
    $LastChangedBy: jimm $
    $LastChangedDate: 2020-05-18 12:57:52 -0700 (Mon, 18 May 2020) $
    $LastChangedRevision: 28710 $
    $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/thm_scw_degap.pro $

(See projects/themis/spacecraft/fields/thm_scw_degap.pro)

## THM_SPINAVG[1]

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    Name:
     spinavg
    Purpose:
     performs a spinavg on B or E field data, results are average values
     over the spin periods -- nothing else
    Calling Sqeuence:
     spinavg,arr_in_t,arr_in_data,arr_in_sunpulse_t,arr_in_sunpulse_data, $
             arr_out_data,arr_out_sigma,npoints,sun_data,$
             min_points=min_points,alpha=alpha,beta=beta
    Input:
      arr_in_t = time array for the data
      arr_in_data = the data to be spin fit
      arr_in_sunpulse_t = time array for sunpulse data
      arr_in_sunpulse_data = sunpulse data
    Output:
      arr_out_data = the array averaged over the spin periods
      sigma = sigma for each spin period
      npoints = number of points in fit for each spin period
      sun_data = midpoint times of spitfit data
    keywords:
      min_points = Minimum number of points to fit.  Default = 5.
      alpha = A parameter for finding fits.  Points outside of sigma*(alpha + beta*i)
              will be thrown out.  Default 1.4.
      beta = A parameter for finding fits.  See above.  Default = 0.4

(See projects/themis/spacecraft/fields/thm_spinavg.pro)

## THM_SPINAVG[2]

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    NAME:
     thm_spinavg
    PURPOSE:
     average data over spin periods, and return a tplot variable
    CALLING SEQUENCE:
     thm_spinavg,var_name_in, $
              sigma=sigma, npoints=npoints, spinaxis=spinaxis, median=median, $
              plane_dim=plane_dim, axis_dim=axis_dim,  $
              min_points=min_points,alpha=alpha,beta=beta, $
              phase_mask_starts=phase_mask_starts,phase_mask_ends=phase_mask_ends, $
              sun2sensor=sun2sensor
    INPUT:
      var_name_in = tplot variable name containing data to fit
    keywords:
      sigma = If set, will cause program to output tplot variable with
              sigma for each period.
      npoints = If set, will cause program to output tplot variable with
                of points in fit.
      spin_frac_offset = If set, the time array of the variable will be
                         offset by this fraction of an average spin
                         period before averaging.
      absv = if set, fit the absolute value.
      min_points = Minimum number of points to fit.  Default = 5.
      alpha = A parameter for finding fits.  Points outside of
              sigma*(alpha + beta*i) will be thrown out for the ith
              iteration.  Default 1.4.
      beta = A parameter for finding fits.  See above.  Default = 0.4
     $LastChangedBy: aaflores $
     $LastChangedDate: 2012-01-26 16:43:03 -0800 (Thu, 26 Jan 2012) $
     $LastChangedRevision: 9624 $
     $URL:

(See projects/themis/spacecraft/fields/thm_spinavg.pro)

## THM_SPINFIT

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    procedure: thm_spinfit

    Purpose: finds spinfits of field data

             finds A,B, and C fits for each period of data, over the entire day

    required parameters:
      var_name_in = tplot variable name containing data to fit

    keywords:
      sigma = If set, will cause program to output tplot variable with sigma for each period.
      npoints = If set, will cause program to output tplot variable with number of points in fit.
      spinaxis = If set, program will output a tplot variable storing the average over the spin axis dimension
                 for each time period.
      median  = If spinaxis set, program will output a median of each period instead of the average.
      plane_dim = Tells program which dimension to treat as the plane. 0=x, 1=y, 2=z. Default 0.
      axis_dim = Tells program which dimension contains axis to average over. Default 0.  Will not
                 create a tplot variable unless used with /spinaxis.
      min_points = Minimum number of points to fit.  Default = 5.
      alpha = A parameter for finding fits.  Points outside of sigma*(alpha + beta*i)
              will be thrown out.  Default 1.4.
      beta = A parameter for finding fits.  See above.  Default = 0.4
      phase_mask_starts = Time to start masking data.  Default = 0
      phase_mask_ends = Time to stop masking data.  Default = -1
      sun2sensor = Tells how much to rotate data to align with sun
                   sensor. This defaults to 45 degrees for plane_dim = 1
                   and 135 degrees for plane_dim = 0
      build_efi_var = if set to a valid string, then this will return an
                      EFI-like variable, with Ex set to spinfit_b, and Ey
                      set to spinfit_c, with the name of build_efi_var

    Example:

          thm_spinfit,'th?_fg?',/sigma

    Notes: under construction!!

    Written by Katherine Ramer
     $LastChangedBy: kramer $
     $LastChangedDate: 2007-06-08 10:10:36 -0700 (Fri June 8, 2007) $
     $LastChangedRevision: 0 $
     $URL:

(See projects/themis/spacecraft/fields/thm_spinfit.pro)

## THM_TEST_FGMCAL

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    Checks for non-monotonic FGM cal. entries, and prints messages if the
    file has a problem.
    No messages = file is ok

(See projects/themis/spacecraft/fields/thm_test_fgmcal.pro)

## THM_UNPACK_HED

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    Function: THM_UNPACK_HED
    	thm_unpack_hed, data_type, hed_array

    Purpose:  Unpacks data packed into HED data.

    Arguements:
    	DATA_TYPE	STRING, one of the L1 data types (eff, scp, fbk, etc.)
    	HED_ARRAY	BYTE[ N, 16], array of header data.

    keywords:
    	None.

    Example:
    	get_data, 'tha_fit_hed', data=d_hed
       hed_data = thm_unpack_hed( 'fit', d_hed.y)

    Notes:
    	-- Returns int( 0) if requested DATA_TYPE is not implemented.
    	-- Returns annonymous structure with variable elements if DATA_TYPE is recognized.
    	-- Not all DATA_TYPEs are implemented; implemented data types (APIDs) listed below:
    		FIT (on-board EFI and FGM spin fits, 410),
    		FBK (FilterBank data, 440),
    		EFI waveform (VA?, VB?, EF?; 441,442,443, 445,446,447, 449,44A,44B),
    		SCM waveform (SCF, SCP, SCW; 444; 448; 44C),
    		FGM waveform (FGL, FGH; 460, 461),
    		FFT spectra (FFP, FFW; 44D, 44E).

     Modification History:
     Written by J Bonnell, 31 Jan 2007
     Modified by
      LeContel 2007-05-24 10:39  (Wed, 24 May 2007)
               Modification for reading scm and efw headers:
               speed = reform( dh[ *, 14]/16b)

     $LastChangedBy: jbonnell $
     $LastChangedDate: 2007-06-16 10:57:56 -0700 (Sat, 16 Jun 2007) $
     $LastChangedRevision: 794 $
     $URL $

(See projects/themis/spacecraft/fields/thm_unpack_hed.pro)

## TIME_DOMAIN_FILTER

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    function time_domain_filter

    purpose: filter data in a tplot structure, assuming constant dt between points,
             returns filtered data in a new tplot structure.

    usage
     new_data = time_domain_filter(data, freq_low, freq_high)

    Parameters
     data : a structure with elements x and y for time and data, respectively, with
            time in seconds.
     freq_low: low cutoff freqency in Hz
     freq_high: high cutoff frequency in Hz

    HISTORY
     Chris Chaston 9-May-2007 ?

    $LastChangedBy: kenb-mac $
    $LastChangedDate: 2007-10-02 09:24:50 -0700 (Tue, 02 Oct 2007) $
    $LastChangedRevision: 1645 $
    $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/time_domain_filter.pro $

(See projects/themis/spacecraft/fields/time_domain_filter.pro)