; DOPOL ;--------------------------------------------------------------- ;! selects application of any polarization calibration ;# ADVERB CALIBRATION POLARIZATION ;----------------------------------------------------------------------- ;; Copyright (C) 1995-1998, 2010 ;; Associated Universities, Inc. Washington DC, USA. ;; ;; This program is free software; you can redistribute it and/or ;; modify it under the terms of the GNU General Public License as ;; published by the Free Software Foundation; either version 2 of ;; the License, or (at your option) any later version. ;; ;; This program is distributed in the hope that it will be useful, ;; but WITHOUT ANY WARRANTY; without even the implied warranty of ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;; GNU General Public License for more details. ;; ;; You should have received a copy of the GNU General Public ;; License along with this program; if not, write to the Free ;; Software Foundation, Inc., 675 Massachusetts Ave, Cambridge, ;; MA 02139, USA. ;; ;; Correspondence concerning AIPS should be addressed as follows: ;; Internet email: aipsmail@nrao.edu. ;; Postal address: AIPS Project Office ;; National Radio Astronomy Observatory ;; 520 Edgemont Road ;; Charlottesville, VA 22903-2475 USA ;----------------------------------------------------------------------- DOPOL LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC ---------------------------------------------------------------- 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 . ----------------------------------------------------------------