! $Header$

SUBROUTINE formcoord(unit,n,x,a,rev,text)
  implicit none
  integer :: n,unit,ndec
  logical :: rev
  real :: x(n),a
  character(len=4) :: text

  integer :: i,id,i1,i2,in
  real :: dx,dxmin

  if(rev) then
     id=-1
     i1=n
     i2=n-1
     in=1
     write(unit,3000) text(1:1)
  else
     id=1
     i1=1
     i2=2
     in=n
  endif

  if (n<2) then
     ndec=1
     write(unit,1000) text,n,x(1)*a
  else
     dxmin=abs(x(2)-x(1))
     do i=2,n-1
        dx=abs(x(i+1)-x(i))
        if (dx<dxmin) dxmin=dx
     enddo

     ndec=-log10(dxmin)+2
     if(mod(n,6)==1) then
        write(unit,1000) text,n,x(i1)*a
        write(unit,2000) (x(i)*a,i=i2,in,id)
     else
        write(unit,1000) text,n
        write(unit,2000) (x(i)*a,i=i1,in,id)
     endif
  endif

1000   format(a4,2x,i4,' LEVELS',43x,f12.2)
2000   format(6f12.2)
  !1000  format(a4,2x,i4,' LEVELS',43x,f12.<ndec>)
  !2000  format(6f12.<ndec>)
3000   format('FORMAT ',a1,'REV')


end subroutine formcoord