; DOCONT
;---------------------------------------------------------------
;! selects a display of contour lines
;# ADVERB PLOT
;-----------------------------------------------------------------------
;;  Copyright (C) 1995, 2020
;;  Associated Universities, Inc. Washington DC, USA.
;;
;;  This program is free software; you can redistribute it and/or
;;  modify it under the terms of the GNU General Public License as
;;  published by the Free Software Foundation; either version 2 of
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;;
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;;  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;  GNU General Public License for more details.
;;
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;;  Software Foundation, Inc., 675 Massachusetts Ave, Cambridge,
;;  MA 02139, USA.
;;
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;;         Postal address: AIPS Project Office
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;-----------------------------------------------------------------------
;---------------------------------------------------------------
DOCONT    LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC
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DOCONT
Type: Adverb  (Logical,  > 0  =>  true)
Use:  True (1) means do a contour map, false (-1) means do not
      do a contour map.
Null value:  true (1)
Tasks:
   GREYS.........Plots images as contours over multi-level grey.
   KNTR..........Make a contour/grey plot file from an image w multiple
                 panels.  DOCONT > 0 requests contour drawing and states
                 which image (1 or 2) should be used.
   PCNTR.........Generate plot file with contours plus polarization
                 vectors.  DOCONT > 0 requests contour drawing and
                 states which image (1, 2, 3, or 4) should be used.
   UVLIN.........Fits and removes continuum visibility spectrum, also can
                 flag.  ICUT controls whether the continuum is retained
                 in the output or not.
   XBASL.........Fits and subtracts nth-order baselines from cube (x
                 axis).  ICUT controls whether the average fit continuum
                 is retained in the output or not.
   ZAMAN.........Fits 1-dimensional Zeeman model to absorption-line data.
                 DOCONT > -1.5 => fit for Ipol leakage into Vpol is
                 required.
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