AIPS HELP file for ANTENNAS in 31DEC09

As of Sat Nov 21 3:50:12 2009

HELP SECTION

ANTENNAS
Type: Adverb  (REAL(50))
Use:  Standard data selection adverb, used to specify a list of antennas
      to be included in, or excluded from, an operation.  If any element
      of the array is negative then all antennas given are excluded;
      else all are included.  The antenna numbers used are the absolute
      values of the elements of ANTENNAS.
Null Value:  0
      ANTENNAS = 0 usually means all antennas.

      ANTENNAS is often used with BASELINE.  In that case, a baseline
      between antenna I and J is selected (or deselected if any of
      ANTENNAS or BASELINE are negative) if
      # in ANTE     # in BASE     Selected or de-selected if
           0             0        always
          >0             0        (I in ANTE) .OR. (J in ANTE)
           0            >0        (I in BASE) .OR. (J in BASE)
          >0            >0        ((I in ANTE) .AND. (J in BASE)) .OR.
                                  ((I in BASE) .AND. (J in ANTE))

       Verbs VLA, EVLA, VLBA, and HSA may be used to set values into
       ANTENNAS (or any other adverb array).  In this case, the equals
       sign is required, e.g.,
               ANTENNAS = EVLA
               BASELINE = VLA
       to process all baselines between new EVLA and old VLA antennas.
       Be careful of INNAME et al., SUBARRAY, and DOINVERS which
       control what these verbs actually do.

EXPLAIN SECTION