#
AIPS HELP file for INTPARM in 31DEC22

#### As of Mon Feb 6 1:41:50 2023

### 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.
XYDIF....Find/apply X minus Y linear polarization phase difference.
INTPARM smooths the spectral solutions.

### EXPLAIN SECTION