AIPS HELP file for QUOUT in 31DEC22
As of Wed Mar 29 16:55:05 2023
QUOUT: Task to write Q/U spectrum to text file for RLDIF
INNAME UV or image data (name).
INCLASS UV or image data (class).
INSEQ 0.0 9999.0 UV or image data (seq. #).
0 => high
INDISK Disk unit #. 0 => any
FORMAT 0.0 4.0 = 0,1 write Q, U
= 2 write polarization angle
OUTTEXT Output text file
SOURCES UV: Source list from CP/SU
INVERS UV: CP table version #
BLC MA: Bottom left corner
TRC MA: Top left corner
Use: RLDIF requires a spectrum of the expected polarization angle of
the polarization calibrator as a function of frequency. One
way to provide those data is via a text file. QUOUT will write
that text file from a UV data set using the CP or SU table
values of Q and U. NOTE that those values must be fully
calibrated - i.e. from a data set on which RLDIF has already
been run. QUOUT is then used to transfer the calibration of a
source to another data set.
If the input is an image "cube", then QUOUT will determine the
output by fitting Q and U in a small window set by BLC and TRC.
The cube may be a four-dimensional (or more) image with Q and U
on a polarization axis or it may be an output of COMB of
polarization angle (OPCODE 'POLA') in three or more
dimensions. The "Q" and "U" written from a POLA image are just
the cos and sin of the average of twice the position angles
rather than properly scaled fluxes.
INNAME.....UV or image file name (name). Standard defaults.
INCLASS....UV or image file name (class). Standard defaults.
INSEQ......UV or image file name (seq. #). 0 => highest.
INDISK.....Disk unit #. 0 => any.
FORMAT.....Write OUTTEXT with Freq, Q, U, source number when FORMAT
is < 1.5. Write it with Freq, Polarization angle, source
number when FORMAT > 1.5.
OUTTEXT....Outout text file. Contents described below.
For UV input
SOURCES....List of sources to be listed. ' '=> all.
INVERS.....CP (calibrator polarization) table version number. If
< 0 or there are no CP tables, use the SU (source)
For image data
BLC........Bottom left corner of area over which image is
TRC........Top right corner
OUTTEXT file format:
1. Begins with a line which defines the contents of the file
;FQUS for columns of frequency, Q, U, and source number.
;FAS for columns of frequency, polarization angle, and
2. Comment lines at any point begin in column 1 with either a
; or a # character.
3. Data lines contain the specified type of data columns:
;FQUS frequency in GHz, Q, U in the same units, and
optionally source number
;FAS frequency in GHz, polarization angle in degrees
(= ATAN2 (U, Q) / 2.0), and optionally source number
The source number may be omitted or set to 0 if there is only
one source included.
# QUOUT run 12-JAN-2011 11:24:35 using CP version 2
4.988000000 0.348104 0.780174 0
4.990000000 0.348104 0.780174 0
4.992000000 0.346920 0.780659 0
4.994000000 0.344028 0.781819 0
4.996000000 0.338668 0.783813 0
4.998000000 0.336427 0.784259 0
# QUOUT run 12-JAN-2011 11:27:03 using CP version 2
4.988000000 32.97708 0
4.990000000 32.97708 0
4.992000000 33.01998 0
4.994000000 33.12441 0
4.996000000 33.31594 0
4.998000000 33.39096 0