FUNCTION dustem_read_dustem_lv,file,silent=silent

;=== determine the number of grains
str='                               '
OPENR,unit,file,/get_lun

;==read comments
str='' & first_char='#'
WHILE first_char EQ '#' DO BEGIN
  readf,unit,str
  first_char=strmid(str,0,1)
ENDWHILE
;readf,unit,str
CLOSE,unit
free_lun,unit
str=strcompress(str)
str=strtrim(str,2)
vv=str_sep(str,' ')
Ngrains=vv(0)
;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)

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

nlines=n_elements(wav)-1

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

return,st

END