PRO dustem_gb_plot_fit_sed,ww,spec,sed, $
                        res=res,errors=errors,chi2=chi2,rchi2=rchi2, $
                        no_spec_error=no_spec_error, $
                        help=help,_extra=extra

;+
; NAME:
;    dustem_gb_plot_fit_sed
; PURPOSE:
;    Plots a model and SED. Parameter values and error are
;    printed on plot. Used for plotting results during fit.
; CATEGORY:
;    Dustem
; CALLING SEQUENCE:
;    dustem_gb_plot_fit_sed,ww,spec,sed[,/no_spec_error][,res=][,errors=][,chi2=][,rchi2=][/help][_extra=]
; INPUTS:
;    ww        = wavelengths for spec (micron)
;    spec      = Model spectrum
;    sed       = SED corresponding to the model
; OPTIONAL INPUT PARAMETERS:
;    res       = fit result values. If set values are written on plot.
;    errors    = fit result errors. If set values are written on plot.
;    chi2      = fit chi^2. if set value is written on plot.
;    rchi2     = Reduced fit chi^2. if set value is written on plot.
;    _extra    = extra parameters for the plot routine
; OUTPUTS:
;    None
; OPTIONAL OUTPUT PARAMETERS:
;    None
; ACCEPTED KEY-WORDS:
;    help      = If set, print this help
; COMMON BLOCKS:
;    None
; SIDE EFFECTS:
;    SED and model are plotted
; RESTRICTIONS:
;    The dustem idl wrapper must be installed
; PROCEDURE:
;    None
; EXAMPLES
;    dustem_gb_plot_fit_sed,ww,spec,sed
; MODIFICATION HISTORY:
;    Written by J.-Ph. Bernard
;    see evolution details on the dustem cvs maintained at CESR
;    Contact J.-Ph. Bernard (Jean-Philippe.Bernard@cesr.fr) in case of problems.
;-

IF keyword_set(help) THEN BEGIN
  doc_library,'dustem_gb_plot_fit_sed'
  goto,the_end
ENDIF

use_col_sed_spec=170    ;color used for the model SED in spectrum channels
use_col_sed_filt=80    ;color used for the model SED in filters

use_model_color=150     ;color used for the model
use_model_line=3        ;linestyle used for the model

;=== plot the data SED
dustem_plot_data_sed,_extra=extra

wav=(*(*!dustem_data).sed).wav
values=(*(*!dustem_data).sed).values
filt_names=(*(*!dustem_data).sed).filt_names
sigma=(*(*!dustem_data).sed).sigma

;=== Over-Plot the computed SED

ind_filt=where(filt_names NE 'SPECTRUM',count_filt)
ind_spec=where(filt_names EQ 'SPECTRUM',count_spec)

IF count_filt NE 0 THEN BEGIN
  plotsym,8

  cgoplot,wav[ind_filt],sed[ind_filt],color=use_col_sed_filt,psym=8,syms=2

ENDIF
IF count_spec NE 0 THEN BEGIN
  plotsym,0

  cgoplot,wav[ind_spec],sed[ind_spec],color=use_col_sed_spec,psym=8,syms=0.5

ENDIF
;stop

;=== Over-Plot the Model

cgoplot,ww,spec,color=use_model_color,linestyle=use_model_line

frmt0='(A20)'      ;used for parameter name
frmt1='(1E10.2)'   ;used for parameter value and error
frmt2='(E10.2)'    ;used for chi^2
IF keyword_set(res) THEN BEGIN
  offset=0.2
  xy_xpos=500.
  Npar=n_elements(res)
  FOR i=0L,Npar-1 DO BEGIN
    sstr=(str_sep((*(*!dustem_fit).param_descs)(i),'(*!dustem_params).'))
    ssstr=sstr(n_elements(sstr)-1)
    str=string(ssstr+'=',format=frmt0)+string(res(i),format=frmt1)
    IF keyword_set(errors) THEN BEGIN
      str=str+textoidl('\pm')+string(errors(i),format=frmt1)
    ENDIF
    xyouts,xy_xpos,10^(1.-(i+1)*offset),str
  ENDFOR
ENDIF
IF keyword_set(chi2) THEN BEGIN
  xyouts,xy_xpos,10^(1.-(Npar+1)*offset),string('chi2=',format=frmt0)+string(chi2,format=frmt2)
;stop
ENDIF
IF keyword_set(rchi2) THEN BEGIN
  xyouts,xy_xpos,10^(1.-(Npar+2)*offset),string('red. chi2=',format=frmt0)+string(rchi2,format=frmt2)
;stop
ENDIF

the_end:

END