FUNCTION dustem_read_dustem,file,silent=silent


;=== determine the number of grains
str='                               '
OPENR,unit,file,/get_lun
readf,unit,str
CLOSE,unit
free_lun,unit
str=strcompress(str)
str=strtrim(str,2)
vv=str_sep(str,' ')
Ngrains=n_elements(vv)-2
;Ngrains=!dustem_params.Ngrains

;Read model output
instruc='readcol,file,wav,'
FOR i=0L,Ngrains-1 DO BEGIN
  instruc=instruc+'em_grain_'+strtrim(i+1,2)+','
ENDFOR
instruc=instruc+'em_tot,silent=silent'
toto=execute(instruc)
;stop

;readcol,wav,em_pah,em_vsg,em_bg,em_tot,silent=silent

nlines=n_elements(wav)

;one_st={wav:0.,em_pah:0.,em_vsg:0.,em_bg:0.,em_tot:0.}
instruc='one_st={wav:0.,'
FOR i=0L,Ngrains-1 DO BEGIN
  instruc=instruc+'em_grain_'+strtrim(i+1,2)+':0.,'
ENDFOR
instruc=instruc+'em_tot:0.}'
toto=execute(instruc)

;stop

st=replicate(one_st,Nlines)

st.wav=wav
FOR i=0L,Ngrains-1 DO BEGIN
  instruc='st.(i+1)='+'em_grain_'+strtrim(i+1,2)
  toto=execute(instruc)
;st.em_vsg=em_vsg
;st.em_bg=em_bg
ENDFOR
st.em_tot=em_tot

return,st

END