; PHNEG
;---------------------------------------------------------------
;! Negates a UV datafile's visibility phase.
;#
;-----------------------------------------------------------------------
;;  Copyright (C) 1998
;;  Associated Universities, Inc. Washington DC, USA.
;;
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;;
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;;  GNU General Public License for more details.
;;
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;-----------------------------------------------------------------------
;---------------------------------------------------------------
PHNEG     LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC
PHNEG     Task which negates all visibility phases in a dataset.
INNAME                             Input UV file name (name)
INCLASS                            Input UV file name (class)
INSEQ             0.0     9999.0   Input UV file name (seq. #)
INDISK            0.0        9.0   Input UV file disk unit #
OUTNAME                            Output UV file name (name)
OUTCLASS                           Output UV file name (class)
OUTSEQ           -1.0     9999.0   Output UV file name (seq. #)
OUTDISK           0.0        9.0   Output UV file disk unit #.
----------------------------------------------------------------
PHNEG
Task:  PHNEG negates the sign of the visibility phase
       for all visibilities in the datafile.  This task was
       created to fix an inconsistency in the phase sign convention
       adopted in the Mitaka correlator FITS generation software.
       Running this task is necesary for FITS data produced directly
       by the Mitaka correlator prior to ?? August 1998.

Adverbs:
  INNAME.....Input UV file name (name).      Standard defaults.
  INCLASS....Input UV file name (class).     Standard defaults.
  INSEQ......Input UV file name (seq. #).    0 => highest.
  INDISK.....Disk drive # of input UV file.  0 => any.
  OUTNAME....Output UV file name (name).     Standard defaults.
  OUTCLASS...Output UV file name (class).    Standard defaults.
  OUTSEQ.....Output UV file name (seq. #).   0 => highest unique
  OUTDISK....Disk drive # of output UV file. 0 => highest with
             space for the file.
----------------------------------------------------------------

Documentor: G. Moellenbrock 98Aug13