subroutine getsyns (lscreen,ncall)
c******************************************************************************
c     This routine commands the syntheses to be done (or resyntheses if 
c     abundances or isotopic ratios are changed)
c******************************************************************************

      implicit real*8 (a-h,o-z)
      include 'Atmos.com'
      include 'Linex.com'
      include 'Pstuff.com'
      include 'Factor.com'
      include 'Dummy.com'


c*****if the syntheses need to be redone: first rewind the output files,
c     then close/reopen line list(s), then rewrite model atmosphere output
      if (choice .eq. 'n') then
         call chabund
         if (choice .eq. 'x') call pltspec (lscreen,ncall)
         rewind nf1out
         rewind nf2out
         if (nflines .ne. 0) then
            close (unit=nflines)
            open (unit=nflines,file=flines,access='sequential',
     .            form='formatted',blank='null',status='old',
     .            iostat=jstat,err=10)
         endif
         if (nfslines .ne. 0) then
            close (unit=nfslines)
            open (unit=nfslines,file=fslines,access='sequential',
     .            form='formatted',blank='null',status='old',
     .            iostat=jstat,err=10)
         endif
         if (plotopt .ne. 0) then
            rewind nf3out
         endif
         write (nf1out,1002) modtype
         if (modprintopt .ge. 1) then
            if (modtype .eq. 'begn      ' .or.
     .          modtype .eq. 'BEGN      ') write (nf1out,1003)
            write (nf1out,1102) moditle
            do i=1,ntau
               dummy1(i) = dlog10(pgas(i))
               dummy2(i) = dlog10(ne(i)*1.38054d-16*t(i))
            enddo
            write (nf1out,1103) wavref,(i,xref(i),tauref(i),t(i),
     .                          dummy1(i), pgas(i),dummy2(i),ne(i),
     .                          vturb(i),i=1,ntau)
            write (nf1out,1104)
            do i=1,95
               dummy1(i) = dlog10(xabund(i)) + 12.0
            enddo
            write (nf1out,1105) (names(i),i,dummy1(i),i=1,95)
            write (nf1out,1106) modprintopt, molopt, linprintopt, 
     .                          fluxintopt
            write (nf1out,1107) (kapref(i),i=1,ntau)
         endif
         linprintopt = linprintalt
         choice = '1' 
      endif


c*****now do the syntheses
      if (numpecatom .eq. 0 .or. numatomsyn .eq. 0) then
         isynth = 1
         isorun = 1
         nlines = 0
         mode = 3
         call inlines (1)
         call eqlib
         call nearly (1)
         call synspec
      else
         do n=1,numatomsyn
            isynth = n
            isorun = n
            start = oldstart
            sstop = oldstop
            mode = 3
            molopt = 2
            call inlines (1)
            call eqlib
            call nearly (1)
            call synspec
            linprintopt = 0
         enddo
      endif
      return
         

c*****a nonsense situation:  the line list read in successfully at the
c*****start, but now there is a problem on re-synthesis
10    write (*,1108)
      stop


c*****format statements
1002  format (13('-'),'MOOG OUTPUT FILE',10('-'),
     .        '(MOOG version NOV 2019)',13('-')//
     .        'THE MODEL TYPE: ',a10)
1003  format ('   The Rosseland opacities and optical depths have ',
     .        'been read in')
1102  format (/'MODEL ATMOSPHERE HEADER:'/a80/)
1103  format ('INPUT ATMOSPHERE QUANTITIES',10x,
     .        '(reference wavelength =',f10.2,')'/3x,'i',2x,'xref',3x,
     .        'tauref',7x,'T',6x,'logPg',4x,'Pgas',6x,'logPe',
     .        5x,'Ne',9x,'Vturb'/
     .        (i4,0pf6.2,1pd11.4,0pf9.1,f8.3,1pd11.4,0pf8.3,
     .        1pd11.4,d11.2))
1104  format (/'INPUT ABUNDANCES: (log10 number densities, log H=12)'/
     .       '      Default solar abundances: Asplund et al. 2009')
1105  format (5(3x,a2,'(',i2,')=',f5.2))
1106  format (/'OPTIONS: atmosphere = ',i1,5x,'molecules  = ',i1/
     .        '         lines      = ',i1,5x,'flux/int   = ',i1)
1107  format (/'KAPREF ARRAY:'/(6(1pd12.4)))
1108  format ('something odd: linelist was OK initially, now cannot ',
     .        'be read; I QUIT!')


      end