; TRIANGLE
;---------------------------------------------------------------
;! specifies closure triangles to be selected/deselected
;# ADVERB CALIBRATION
;-----------------------------------------------------------------------
;;  Copyright (C) 1995
;;  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
;-----------------------------------------------------------------------
;---------------------------------------------------------------
TRIANGLE  LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC
----------------------------------------------------------------
TRIANGLE
Type: Adverb  (REAL(50))
Use:  Standard data selection adverb, used in conjunction with
      ANTENNAS and BASELINE to specify closure triangles.
      If closure triangles are being used, then up to
      50 specific triangles may be specified.  The i'th triangle
      is specified by a non-zero value of ANTENNAS(i),
      BASELINE(i), and TRIANGLE(i).  If ANTENNAS(i) is non-zero
      but the other two corresponding entries are null, then all
      triangles containing ANTENNAS(i) are specified.  Similarly
      for the case where only TRIANGLES(i) is null.  The list of
      triangles is terminated by simultaneous null values in
      all three selection arrays.  If any element of these three
      arrays is less than zero, then all triangles except those
      explicitly mentioned are selected.
Null Value:  0
      All null value means use all antennas.
----------------------------------------------------------------
