(form "00131" (size 68 17)
  (help "00131_TIP_0")
  (heading "CREATE A GRID FILE")  
  (field "grdname" (position 28  3) (display_length 26) (input allowed)
    (null allowed) (max_length 26)
    (file (extension trim "*.grd"))
    (help "00131_TIP_1"))
  (field "ystep" (position  6  6) (display_length 16) (input allowed)
    (low_bound 0.1) (high_bound 999999)
    (translate upper) (format real_8) (null disallowed) (max_length 16)
    (help "00131_TIP_2"))
  (field "ymin" (position 27  6) (display_length 16) (input allowed)
    (translate upper) (format real_8) (null disallowed) (max_length 16)
    (help "00131_TIP_3"))
  (field "ymax" (position 48  6) (display_length 16) (input allowed)
    (translate upper) (format real_8) (null disallowed) (max_length 16)
    (help "00131_TIP_4"))
  (field "xstep" (position  6  7) (display_length 16) (input allowed)
    (low_bound 0.1) (high_bound 999999)
    (translate upper) (format real_8) (null disallowed) (max_length 16)
    (help "00131_TIP_5"))
  (field "xmin" (position 27  7) (display_length 16) (input allowed)
    (translate upper) (format real_8) (null disallowed) (max_length 16)
    (help (field "ymin")))
  (field "xmax" (position 48  7) (display_length 16) (input allowed)
    (translate upper) (format real_8) (null disallowed) (max_length 16)
    (help (field "ymax")))
  (field "lendesc" (position 48  9) (display_length  3) (input allowed)
    (low_bound 32) (high_bound 512)
    (format integer_4) (null disallowed) (max_length 3)
    (help "00131_TIP_6"))
  (field "ndesc" (position 48 10) (display_length  3) (input allowed)
    (low_bound 0) (high_bound 100)
    (format integer_4) (null disallowed) (max_length 3)
    (help "00131_TIP_7"))
  (field "zopt" (position 50 15) (display_length  1) (input allowed)
    (value_in "N" "R" "F")
    (translate upper) (null allowed) (max_length 1)
    (help "00131_TIP_8"))
  (default_buttons)
)