AIPS HELP file for INTPARM in 31DEC26

As of Thu Dec 11 19:48:31 2025

HELP SECTION

INTPARM
Type: Adverb  (REAL(3))
Use:  Used to specify the parameters of the interpolation function to
      be applied to spectral channels.  SPECR and UVGRD have the most
      general usage as:
      INTPARM(1) = type of interpolation (weighted smoothing) to use
         0 => Weighted substitution (INTPARM(2 and 3) ignored) in
              UVGRD, FFT in SPECR
         1 => Hanning
         2 => Gaussian
         3 => Boxcar
         4 => Sinc (i.e. sin(x)/x)
         5 => Exponential
         6 => Median window
         7 => 2 point
      INTPARM(2) = the "diameter" of the function, i.e. width between
         first nulls of Hanning triangle and sinc function, FWHM of
         Gaussian, Exponential, width of Boxcar and median window.
         Defaults (if < 0.1) are 4, 2, 2, 3, 1.99, 4 channels for
         INTPARM(1) = 1 - 6.
      INTPARM(3) = the diameter over which the convolving function has
         value - in channels.  Defaults: 1, 3, 1, 4, 3, 1 times
         INTPARM(2) used when input INTPARM(3) < INTPARM(2) (after
         application of defaults).
Null value:  0, see above.
Tasks:
   PCAL..........Determines instrumental polarization for UV data.
                 INTPARM smooths the spectral solutions.
   RLDIF.........Determines Right minus Left phase difference, corrects
                 cal files.  INTPARM smooths the spectral solutions.
   SPECR.........Spectral regridding task for UV data.  INTPARM smooths
                 the input to the output (including FFT methods).
   UVFRE.........Makes one data set have the spectral structure of
                 another.  INTPARM smooths the input visibilities onto
                 the frequencies of the output spectrum.
   VHDIF.........Find/apply V minus H linear polarization phase
                 difference.
   XYDIF.........Find/apply X minus Y linear polarization phase
                 difference.  INTPARM smooths the spectral solutions.

EXPLAIN SECTION