(form "20500" (size 70 9)
 (heading "DEFINE SLICES FOR BLOCK MODEL")
 (label (position 2 2) (text "Width of slices"))
 (field "width" (position  24  2) (display_length  10) (input allowed)
  (format real_8) (default "1.0") (translate upper) (null disallowed)
  (max_length 10) (low_bound 0.0)
  )
 (label (position 2 3) (text "Slice range"))
 (field "range" (position  24  3) (display_length  20) (input allowed)
  (format range) (default "0") (null disallowed) (max_length 40)
  )
 (label (position 2 4) (text "Use as"))
 (field "slice_type" (position  24  4) (display_length  14) (input allowed)
  (value_in "section plane" "axis line")
  (default "section plane") 
  (translate lower) (null disallowed)
  )
 (label (position 2 5) (text "Left end/Axis start"))
 (label (position 22 5) (text "Y")) 
 (field "y1" (position  24  5) (display_length  10) (input allowed)
  (format real_8) (default "0.0") (translate upper) (null disallowed)
  (max_length 16) (decimals 3)
  )
 (label (position 38 5) (text "X"))
 (field "x1" (position  40  5) (display_length  10) (input allowed)
  (format real_8) (default "0.0") (translate upper) (null disallowed)
  (max_length 16) (decimals 3)
  (help (field "y1")))
 (label (position 55 5) (text "Z"))
 (field "z1" (position  57  5) (display_length  10) (input allowed)
  (format real_8) (default "0.0") (translate upper) (null disallowed)
  (max_length 16) (decimals 3) 
  (help (field "y1")))
 (label (position 2 6) (text "Right end/Axis end"))
 (label (position 22 6) (text "Y"))
 (field "y2" (position  24  6) (display_length  10) (input allowed)
  (format real_8) (default "0.0") (translate upper) (null disallowed)
  (max_length 16) (decimals 3) 
  (help (field "y1")))
 (label (position 38 6) (text "X"))
 (field "x2" (position  40  6) (display_length  10) (input allowed)
  (format real_8) (default "0.0") (translate upper) (null disallowed)
  (max_length 16) (decimals 3) 
  (help (field "y1")))
 (label (position 55 6) (text "Z"))
 (field "z2" (position  57  6) (display_length  10) (input allowed)
  (format real_8) (default "0.0") (translate upper) (null disallowed)
  (max_length 16) (decimals 3) 
  (help (field "y1")))
 (default_buttons)
)