FUNCTION dustem_create_synchrotron,key=key,val=val,help=help

;+
; NAME:
;    dustem_create_synchrotron
; PURPOSE:
;    DUSTEM pluggin to compute synchrotron emission
; CATEGORY:
;    DUSTEM Wrapper
; CALLING SEQUENCE:
;    synch=dustem_create_synchrotron([,key=][,val=])
; INPUTS:
;    None
; OPTIONAL INPUT PARAMETERS:
;    key  = input parameter number
;    val  = input parameter value
; OUTPUTS:
;    synch = synch spectrum (on dustem wavelengths)
; OPTIONAL OUTPUT PARAMETERS:
;    None
; ACCEPTED KEY-WORDS:
;    help                  = if set, print this help
; COMMON BLOCKS:
;    None
; SIDE EFFECTS:
;    None
; RESTRICTIONS:
;    None
; PROCEDURE:
;    This is a dustem pluggin
; EXAMPLES
;
; MODIFICATION HISTORY:
;    Written by JPB 
;-

IF keyword_set(help) THEN BEGIN
  doc_library,'dustem_create_synchrotron'
  output=0.
  goto,the_end
ENDIF

;default values of input parameters
s=3           ;power spectrum of CR E distribution
A=1.          ;Synchrotron radiation amplitude at 10 mm

IF keyword_set(key) THEN BEGIN 
  a=where(key EQ 1,count1)
  b=where(key EQ 2,count2)
  IF count1 NE 0 then s=(val(a))(0)
  IF count2 NE 0 then A=(val(b))(0)
ENDIF
  
IF !dustem_which EQ 'DESERT' THEN BEGIN
  lambir=((*!dustem_params).gemissiv.lambir)
ENDIF ELSE BEGIN
  lambir=((*!dustem_params).lambda.lambda)
ENDELSE

cmic=3.e14
nu=cmic/lambir
lambir_ref=10000.

;see Deschenes et al 2008, eq 6
synch=nu^(-(s+3.)/2.)
norm=interpol(synch,lambir,lambir_ref)
synch=synch/norm*A

output=synch

the_end:
RETURN,output
  
END