FUNCTION dustem_read_size,file,silent=silent

st=''
Nmax=10000L
sts=strarr(Nmax)
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

;read number of bulk materials
Nbulk=fix(str)

readf,unit,density
readf,unit,mass_frac
readf,unit,Nsize
Nsize=fix(Nsize)

a=fltarr(Nsize) & dloga=fltarr(Nsize) & a4dnda=fltarr(Nsize)
f_mix=fltarr(nsize) & f_pol=fltarr(nsize) & rho_eff=fltarr(nsize) & fv=fltarr(Nsize)
FOR i=0L,Nsize-1 DO BEGIN
  readf,unit,st
  stv=str_sep(strtrim(strcompress(st),2),' ')
  a(i)=float(stv(0))
  dloga(i)=float(stv(1))
  a4dnda(i)=float(stv(2))
  f_mix(i)=float(stv(3))
  f_pol(i)=float(stv(4))
  rho_eff(i)=float(stv(5))
  fv(i)=float(stv(6))
ENDFOR

close,unit
free_lun,unit

one_size_st={a:0.,dloga:0.,a4dnda:0.,f_mix:0.,f_pol:0.,rho_eff:0.,fv:0.}
size_st=replicate(one_size_st,Nsize)

size_st.a=a
size_st.dloga=dloga
size_st.a4dnda=a4dnda
size_st.f_mix=f_mix
size_st.f_pol=f_pol
size_st.rho_eff=rho_eff
size_st.fv=fv

full_st={file:file,Nbulk:Nbulk,density:density,mass_frac:mass_frac,Nsize:Nsize,size_st:size_st}

return,full_st

END