AIPS NRAO AIPS HELP file for SHAHO in 31DEC21



As of Wed Oct 20 16:33:53 2021


SHAHO: Task to Flag holography data for shadowing

INPUTS

INNAME                             UV data (name).
INCLASS                            UV data (class).
INSEQ             0.0    9999.0    UV data (seq. #).  0 => high
INDISK            0.0       9.0    Disk unit #.  0 => any
SOURCES                            Sources selected/deselected
ANTENNAS                           Reference antennas
OUTFGVER                           Flag table version number
                                      Used w single-source too
APARM                              5: > 0 flag for shadowing
                                      shadow diameter in m
                                   6: flag for cross-talk
                                     (see help) BL in m
DOHIST            -3.0      1.0    > 0 -> add to history

HELP SECTION

SHAHO
Type:  Task
Use:   Holography data can be flagged by modifying a flag (FG) table.
       This is done for both multi- and single-source data sets.  The
       only allowed reason here is shadowing of holography data.

Adverbs:
  INNAME.....UV file name (name).       Standard defaults.
  INCLASS....UV file name (class).      Standard defaults.
  INSEQ......UV file name (seq. #).     0 => highest.
  INDISK.....Disk unit #.               0 => any.
  SOURCES....List of sources in a raw data file to be selected.
             If SOURCES = ' ', SOURCES(1) is set to 'HOLORASTER'
  ANTENNAS...A list of ALL non-moving (reference) antennas.
  OUTFGVER...Specifies the version of the flagging table into which
             the flags are written (0 => highest, or 1 if no FG table
             exists) for all data sets.
  APARM......Flagging may be done on shadowing.

             APARM(5) <= 0 -> 25.
             This task flags data based on shadowing of one antenna by
             another in the array.  APARM(5) gives the minimum baseline
             in meters before shadowing is thought to occur (e.g. 25 for
             the VLA).  You may also set APARM(6) to the minimum
             baseline in meters below which cross-talk is likely to
             occur.  This deletes the single baseline which may cause
             shadowing if it shortens more but not the other baselines
             to the (pre)-shadowed antenna.  This would be meant to omit
             possible cross-talk when one antenna starts to see another
             in its near-in sidelobes.
  DOHIST.....True means add the individual flags in the history file,
             else just record the use of UVFLG.  (True is > 0)

EXPLAIN SECTION


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