; DO3DIMAG
;---------------------------------------------------------------
;! specifies whether uvw's are reprojected to each field center
;# ADVERB IMAGING
;-----------------------------------------------------------------------
;;  Copyright (C) 1997
;;  Associated Universities, Inc. Washington DC, USA.
;;  Eric W. Greisen
;;
;;  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
;-----------------------------------------------------------------------
DO3DIMAG  LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC
----------------------------------------------------------------
DO3DIMAG
Type: Adverb  (scalar)
Use:  To specify whether a data set is imaged with "3-dimensional"
      techniques.

Null value: 0
      Taken to mean do not do 3-D techniques.

Tasks:
    IMAGR........Fourier transforms and Cleans uv data with wide-field,
                 interactive TV, and data weighting options.
                 IMAGR's idea of 3-D techniques is (on DO3DIMAG > 0) to
                 re-project the u,v,w coordinates to those of the center
                 of each field.  In this way, each field is tangent to
                 the celestial sphere and remains "in focus" over a
                 larger area than if the u.v.w were not reprojected
                 (with DO3DIMAG <= 0)
----------------------------------------------------------------