;+
;FUNCTION:	peak_2d(dat,ENERGY=en,ERANGE=er,EBINS=ebins,ANGLE=an,ARANGE=ar,BINS=bins)
;INPUT:	
;	dat:	structure,	2d data structure filled by get_eesa_surv, get_eesa_burst, etc.
;KEYWORDS
;	ENERGY:	fltarr(2),	optional, min,max energy range for integration
;	ERANGE:	fltarr(2),	optional, min,max energy bin numbers for integration
;	EBINS:	bytarr(na),	optional, energy bins array for integration
;					0,1=exclude,include,  
;					na = dat.nenergy
;	ANGLE:	fltarr(2),	optional, min,max pitch angle range for integration
;	ARANGE:	fltarr(2),	optional, min,max angle bin numbers for integration
;	BINS:	bytarr(nb),	optional, angle bins array for integration
;					0,1=exclude,include,  
;					nb = dat.ntheta
;	BINS:	bytarr(na,nb),	optional, energy/angle bins array for integration
;					0,1=exclude,include
;PURPOSE:
;	Returns the energy of the energy flux peak, eV
;NOTES:	
;	Function normally called by "get_2dt.pro" to generate 
;	time series data for "tplot.pro".
;
;CREATED BY:
;	J.McFadden
;LAST MODIFICATION:
;	97-6-4		J.McFadden
;-
function peak_2d,dat2,ENERGY=en,ERANGE=er,EBINS=ebins,ANGLE=an,ARANGE=ar,BINS=bins

peak = 0.

if dat2.valid eq 0 then begin
  print,'Invalid Data'
  return, peak
endif

dat = conv_units(dat2,"eflux")		; Use Energy Flux
na = dat.nenergy
nb = dat.nbins
	
ebins2=replicate(1b,na)
if keyword_set(en) then begin
	ebins2(*)=0
	er2=[energy_to_ebin(dat,en)]
	if er2(0) gt er2(1) then er2=reverse(er2)
	ebins2(er2(0):er2(1))=1
endif
if keyword_set(er) then begin
	ebins2(*)=0
	er2=er
	if er2(0) gt er2(1) then er2=reverse(er2)
	ebins2(er2(0):er2(1))=1
endif
if keyword_set(ebins) then ebins2=ebins

bins2=replicate(1b,nb)
if keyword_set(an) then begin
	if ndimen(an) ne 1 or dimen1(an) ne 2 then begin
		print,'Error - angle keyword must be fltarr(2)'
	endif else begin
		bins2=angle_to_bins(dat,an)
	endelse
endif
if keyword_set(ar) then begin
	bins2(*)=0
	if ar(0) gt ar(1) then begin
		bins2(ar(0):nb-1)=1
		bins2(0:ar(1))=1
	endif else begin
		bins2(ar(0):ar(1))=1
	endelse
endif
if keyword_set(bins) then bins2=bins

if ndimen(bins2) ne 2 then bins2=ebins2#bins2


data = dat.data*bins2
if ndimen(data) eq 2 then spec = total(data,2) else spec=data
maxspec = max(spec,index)
if ndimen(dat.energy) eq 2 then peak = dat.energy(index,0) else peak = dat.energy(index)

return, peak

end

