(form "00273" (size 71 13)
  (help "00273_TIP_0")
  (heading "DEFINE A SUBGRID FOR PROCESSING")
  (label (position 24  3) (text "Current grid dimensions"))
  (label (position  6  4) (text "Step size"))
  (label (position 27  4) (text "Minimum"))
  (label (position 48  4) (text "Maximum"))
  (label (position  3  5) (text "Y"))
  (label (position  3  6) (text "X"))
  (label (position 25  8) (text "Select a subgrid"))
  (label (position 19  9) (text "Minimum"))
  (label (position 40  9) (text "Maximum"))
  (label (position 16 10) (text "Y"))
  (label (position 16 11) (text "X"))
  (field "ystep" (position  6  5) (display_length 16) (input disallowed))
  (field "ymin" (position 27  5) (display_length 16) (input disallowed))
  (field "ymax" (position 48  5) (display_length 16) (input disallowed))
  (field "xstep" (position  6  6) (display_length 16) (input disallowed))
  (field "xmin" (position 27  6) (display_length 16) (input disallowed))
  (field "xmax" (position 48  6) (display_length 16) (input disallowed))
  (field "yfrom" (position 19 10) (display_length 16) (input allowed)
    (translate upper) (format real_8) (null disallowed) (max_length 16))
  (field "yto" (position 40 10) (display_length 16) (input allowed)
    (translate upper) (format real_8) (null disallowed) (max_length 16))
  (field "xfrom" (position 19 11) (display_length 16) (input allowed)
    (translate upper) (format real_8) (null disallowed) (max_length 16))
  (field "xto" (position 40 11) (display_length 16) (input allowed)
    (translate upper) (format real_8) (null disallowed) (max_length 16))
  (default_buttons)
)