AIPS HELP file for DOPOL in 31DEC09

As of Sat Nov 21 18:36:16 2009

HELP SECTION

DOPOL
Type: Adverb  (Scalar)
Use:  Standard data calibration adverb.  If > 0 then the uv-data will be
      corrected for the instrumental polarization response at each
      antenna, as stored in the antenna (AN) table. The following
      correction modes are available:
        (1) Apply the standard polarization and parallactic angle
            corrections. For the linear D-term approx., only first-order
            terms are retained.
      For 'VLBI' polarization solutions, two further modes are possible:
        (2) If DOPOL > 1.5, include 2nd order D-term coefficients when
            using the linear D-term approximation, and correct both
            parallel- and cross-hand data. Use approximations for
            missing polarization data when computing the correction
            matrices.
        (3) If DOPOL > 2.5, do as in (2), but apply rigorous flagging,
            excluding any output visibility data which have ANY missing
            polarization correlation pairs.
Null value:  false (0) => do no polarization calibration .

EXPLAIN SECTION