(form "00673" (size 35 7)
   (help "00673_TIP_0")
  (heading "INVERSE DISTANCE PARAMETERS")
  (label (position  2  3) (text "Inverse distance power"))
  (label (position  2  4) (text "Constrain interpolation?"))

  (field "power" (position 25  3) (display_length  3) (input allowed)
    (low_bound 0) 
    (format integer_4) (null disallowed) (max_length 2)
    (default "2")
    (help "00673_TIP_1")
  )
  (field "constrain" (position 25  4) (display_length  1) (input allowed)
   (value_in "Y" "N") (default "N")
   (translate upper) (null allowed) (max_length 1)
   (help "00673_TIP_2")
  )

  (default_buttons)
)