#
AIPS HELP file for DOPOL in 31DEC19

#### As of Wed Feb 20 16:17:38 2019

### 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 = 2, 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 = 3, do as in (2), but apply rigorous flagging,
excluding any output visibility data which have ANY missing
polarization correlation pairs.
To avoid use of a PD table when present, set DOPOL = 6, 7, or 8
to get the action of 1, 2, or 3 with the AN file polarizations
rather than the PD (spectral) polarizations.
Null value: false (0) => do no polarization calibration .

### EXPLAIN SECTION