(form "00051" (size 51 13)
  (heading "SMOOTH CONTOUR STRINGS")
  (label (position  3  3) (text "Define the string files to be smoothed"))
  (label (position  3  4) (text "Location"))
  (label (position  3  5) (text "ID range"))
  (label (position  3  7) (text "Define files to contain smoothed strings"))
  (label (position  3  8) (text "Location"))
  (label (position  3  9) (text "Number of lines per segment"))
  (label (position  3 10) (text "(S)pline or (I)nterpolation smoothing"))
  (label (position  3 11) (text "Retain descriptions"))
  (field "conloc" (position 14  4) (display_length 26) (input allowed)
    (null allowed) (max_length 26)
    (file (link "conrng") (extension "*.str"))
    )
  (field "conrng" (position 14  5) (display_length 32) (input allowed)
    (format range) (null allowed) (max_length 32)
    (help (field "conloc")))
  (field "smthloc" (position 14  8) (display_length 26) (input allowed)
    (null allowed) (max_length 26)
    (file output (link "dummy") (extension "*.str"))
    )

  (field "dummy" (position 1  2) (display_length 16)
    (foreground (user_option "form_background"))
    (background (user_option "form_background"))
    (input disallowed)
  )


  (field "nlines" (position 32  9) (display_length  2) (input allowed)
    (low_bound 2) (high_bound 10)
    (format integer_4) (null disallowed) (max_length 2)
    )
  (field "smooth" (position 36 10) (display_length  1) (input allowed)
    (value_in "S" "I")
    (translate upper) (null allowed) (max_length 1)
    )
  (field "swadesc" (position 24 11) (display_length  1) (input allowed)
    (value_in "Y" "N")
    (translate upper) (null allowed) (max_length 1)
    )
  (default_buttons)
)