PRO dustem_write_pol,dir,st

Ncomments=7
c=strarr(Ncomments)

c(0)='# DUSTEM: polarization parameters'
c(1)='# for f_pol and cos(theta0)'
c(2)='#'
c(3)='# atresh pstiff plev'
c(4)='# cteta0'
c(5)='# npol'
c(6)='#'

Nst=n_elements(st)

FOR i=0L,Nst-1 DO BEGIN

    ffile=st(i).file

    IF ffile NE '' THEN BEGIN

	   fv=str_sep(ffile,'/')
       file=dir+fv(n_elements(fv)-1)
    	openw,unit,file,/get_lun

    	FOR ii=0,Ncomments-1 DO printf,unit,c(ii)

    	printf,unit,st(i).atresh,st(i).pstiff,st(i).plev,format='(3(E18.10,2X))'
    	printf,unit,st(i).cteta0,format='(1E8.2)'
    	printf,unit,st(i).npol,format='(I1)'

    	close,unit
    	free_lun,unit

    ENDIF

ENDFOR

END