anchor.diff:  slip_file = ''
   time_file = ''
   depth_file = ''
  +area_file = ''
   clip_file = ''
   epi_file = ''
   isOutputDefined = .false.
  
positive.code:                   slip_file, &
                    time_file, &
                    depth_file, &
                    clip_file, &
                    clip_type, &
                    epi_file, &
  
negative.code: endif
  if (depth_file.ne.'') then
      open(unit=23,file=depth_file,status='unknown')
  endif
  if (area_file.ne.'') then
      open(unit=24,file=area_file,status='unknown')
  endif
  if (epi_file.ne.'') then
      open(unit=31,file=epi_file,status='unknown')
  