; BOX
;---------------------------------------------------------------
;! specifies pixel coordinates of subarrays of an image
;# ADVERB IMAGING
;-----------------------------------------------------------------------
;;  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
;;  the License, or (at your option) any later version.
;;
;;  This program is distributed in the hope that it will be useful,
;;  but WITHOUT ANY WARRANTY; without even the implied warranty of
;;  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;  GNU General Public License for more details.
;;
;;  You should have received a copy of the GNU General Public
;;  License along with this program; if not, write to the Free
;;  Software Foundation, Inc., 675 Massachusetts Ave, Cambridge,
;;  MA 02139, USA.
;;
;;  Correspondence concerning AIPS should be addressed as follows:
;;         Internet email: aipsmail@nrao.edu.
;;         Postal address: AIPS Project Office
;;                         National Radio Astronomy Observatory
;;                         520 Edgemont Road
;;                         Charlottesville, VA 22903-2475 USA
;-----------------------------------------------------------------------
;---------------------------------------------------------------
BOX       LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC
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BOX
Type: Adverb   (Real(4,10))
Use:  An array, dimensioned (4,10), containing 10 sets of of four
      numbers.  Each quartet represents a rectangle in an image.  The
      four numbers are Bottom Left Corner (X,Y) and Top Right Corner
      (X,Y) defining each rectangle.  The values are in pixels.  For
      many uses the adverb NBOXES is used to designate the number of
      rectangles used in BOX

      BOX has also been used to contain a list of columns or of ranges.
Null value:   0
      Null value may mean all.
Tasks:
   APGS..........Deconvolves image with Gerchberg-Saxton algorithm.
   APVC..........Deconvolves images with van Cittert algorithm.
   EXTAB.........Exports AIPS table data as tab-separated text.  BOX
                 is a list of columns to be printed.
   FUDGE.........Modifies UV data with user's algorithm: paraform task.
                 BOX is an adverb to supply more data to the task.
   IMFLT.........Fits and removes a background intensity plane from an
                 image.  BOX provides the regions to fit the flattening
                 parameters.
   IMLIN.........Fits and removes continuum emission from cube.  BOX
                 is a list of begin and end channels numbers.
   MFPRT.........Prints MF tables in a format needed by modelling
                 software.  BOX is a list of columns to be printed.
   PRTAB.........Prints any table-format extension file.  BOX is a list
                 of columns to be printed.
   SERCH.........Finds line signals in transposed data cube.  BOX is a
                 list of begin and end spectral channels.
   SNCOP.........Task to copy SN table averaging some input IFs.  BOX is
                 a list of IF ranges to average.
   STEER.........Task which deconvolves the David Steer way.
   TADIF.........Prints differences between two table-format extension
                 files.  BOX is a list of columns to be examined.
   UTESS.........Deconvolves images by maximizing emptiness.
   VTESS.........Deconvolves sets of images by the Maximum Entropy Method.
   XBASL.........Fits and subtracts nth-order baselines from cube (x
                 axis).  BOX is a list of begin and end spectral
                 channels to be fit.
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