AIPS HELP file for SPECTRAL in 31DEC25

As of Fri Nov 14 14:03:29 2025

HELP SECTION

SPECTRAL
Type: Scalar
Use:  To tell a task whether it should do some operation in a spectral
      chsnnel-dependent fashion or in a channel-independent fashion.
      SPECTRAL > 0 => channel-dependent methods hould be used.

Default: <= 0 => False  => do continuum methods
         >  0 => True   => do spectral methods

Tasks:
   PCAL..........Computes antenna-based polarization leakage terms and,
                 optionally, also determines source polarization (Q, U,
                 V).  SPECTRAL false selects the familiar IF dependent
                 solution which is stored in the antenna and source
                 tables.  SPECTRAL true selects a channel-dependent
                 solution which is stored in PD (leakage) and CP
                 (source) tables which resemble bandpass tables.
   RLDIF.........Determines Right minus Left phase difference, corrects
                 cal files
   TRUEP.........Determines true antenna polarization from special data
                 sets.
   VHDIF.........Find/apply V minus H linear polarization phase
                 difference.
   XYDIF.........Find/apply X minus Y linear polarization phase
                 difference.

EXPLAIN SECTION