AIPS HELP file for SHOUV in 31DEC24
As of Wed Apr 24 23:38:50 2024
SHOUV: Displays uv data in various ways.
INPUTS
INNAME UV data (name).
INCLASS UV data (class).
INSEQ 0.0 9999.0 UV data (seq. #). 0 => high
INDISK 0.0 9.0 Disk unit #. 0 => any
OPTYPE List type:
'CLOS', 'SPEC', 'AVIF'
SOURCES Source list
CALCODE Calibrator code ' '=>all
TIMERANG Time range to list
STOKES Stokes type to list.
SELBAND Bandwidth to select (kHz)
SELFREQ Frequency to select (MHz)
FREQID Freq. ID to select.
None selected => 1.
BIF 0.0 100.0 Lowest IF number 0=1
EIF 0.0 100.0 Highest IF number
BCHAN 0.0 2048.0 Low channel number 0=>1
ECHAN 0.0 2048.0 High channel number
ANTENNAS Antennas to list
UVRANGE 0.0 UV range in kilolambda
SUBARRAY 0.0 1000.0 Subarray, 0=>1
Cal. info for input:
DOCALIB -1.0 101.0 > 0 calibrate data & weights
> 99 do NOT calibrate weights
GAINUSE CAL (CL or SN) table to apply
DOPOL -1.0 10.0 If >0 correct polarization.
PDVER PD table to apply (DOPOL>0)
BLVER BL table to apply.
FLAGVER Flag table version
DOBAND -1.0 10.0 If >0 apply bandpass cal.
Method used depends on value
of DOBAND (see HELP file).
BPVER Bandpass table version
SMOOTH Smoothing function. See
HELP SMOOTH for details.
DPARM Control info:
(1) 0=amp, 1=phase, 2=RMS
(2) 0=vec avg, 1=scalar
(3) No. digits per column
5-7: amplitude;
5-9: phase (def=5)
(4) avg. time min
DOCRT -3.0 132.0 > 0 -> use the terminal,
else use the line printer
> 72 => terminal width
OUTPRINT
Printer disk file to save
BADDISK 0.0 10.0 Disk to avoid for scratch.
HELP SECTION
SHOUV
Type: Task
Use: Prints information in a uv data base in a variety of
possible forms. Numerous selection criteria are
available and calibration and flagging may optionally be
applied.
SHOUV will work on multisource, indexed files or TB
sorted single source files in some modes.
Not all adverbs apply to all types of listing; the
following notes when an adverb is used for only some
listing types or its useage depends on the type.
Adverbs:
INNAME.....UV file name (name). Standard defaults.
INCLASS....UV file name (class). Standard defaults.
INSEQ......UV file name (seq. #). 0 => highest.
INDISK.....Disk unit #. 0 => any.
OPTYPE.....Type of listing desired:
'CLOS'=print closure phases for triples composed of
the antennas in ANTENNAS as triplets, e.g. ANTE=
1,2,3,5,6,7 will display triplets 1-2-3 and 5-6-7
'SPEC'=displays selected channels and IFs.
'AVIF'=like SPEC but all channels in each IF are
averaged first.
SOURCES....List of sources to be listed. ' '=> all; if any
starts with a '-' then all except ANY source named.
CALCODE....Calibrators may be selected on the basis of the
calibrator code given in the SU table.
' ' => any calibrator code selected
'* ' => any non blank code (cal. only)
'-CAL' => blank codes only (no calibrators)
anything else = calibrator code to select.
NB: The CALCODE test is applied in addition to the
other selection tests
TIMERANG...Time range of the data to be listed. In order:
Start day, hour, min. sec,
end day, hour, min. sec. Days relative to ref.
date.
STOKES.....The desired Stokes type of the listed data:
'I','Q','U','V','RR','LL','RL','LR' ' '=>'I'
SELBAND....Bandwidth of data to be selected. If more than
one IF is present SELBAND is the width of the
first IF required. Units = kHz, 0=> all
SELFREQ....Frequency of data to be selected. If more than
one IF is present SELFREQ is the frequency of the
first IF required. Units = MHz, 0=> all
FREQID.....Frequency identifier to select (you may determine
which is applicable from the OPTYPE='SCAN' listing
produced by LISTR. If either SELBAND or SELFREQ
are set, their values overide that of FREQID.
However, setting SELBAND and SELFREQ may result in
an ambiguity. In that case the task will request
that you use FREQID. If neither SELBAND, SELFREQ
nor FREQID are specified then the first FQ id in
the FQ table (usually 1) will be used.
BIF........Lowest IF to list. 0=>1
EIF........Highest IF to list. 0 =>highest
BCHAN......First channel to list. 0=>1
ECHAN......Last channel to list. 0=>highest
ANTENNAS...A list of the antennas to list. The detailed use
of ANTENNAS depends on OPTYPE.
UVRANGE....Range of projected spacings to be listed in 1000's
of wavelengths. 0 => 1, 1.E10
SUBARRAY...Subarray number to list. 0=>1.
DOCALIB....If true (>0), calibrate the data using information in the
specified Cal (CL) table for multi-source or SN table for
single-source data. Also calibrate the weights unless
DOCALIB > 99 (use this for old non-physical weights).
GAINUSE....Version number of the Cal. table to apply to the
data if DOCALIB=1. Refers to a CL table for
multisource data of an SN table for single source.
DOPOL......If > 0 then correct data for instrumental polarization as
represented in the AN or PD table. This correction is
only useful if PCAL has been run or feed polarization
parameters have been otherwise obtained. See HELP DOPOL
for available correction modes: 1 is normal, 2 and 3 are
for VLBI. 1-3 use a PD table if available; 6, 7, 8 are
the same but use the AN (continuum solution) even if a PD
table is present.
PDVER......PD table to apply if PCAL was run with SPECTRAL true and
0 < DOPOL < 6. <= 0 => highest.
BLVER......Version number of the baseline based calibration
(BL) table to appply. <0 => apply no BL table,
0 => highest.
FLAGVER....(multisource) specifies the version of the
flagging table to be applied. 0 => highest
numbered table. <0 => no flagging to be applied.
DOBAND.....(multi-source) If true (>0) then correct the data for the
shape of the antenna bandpasses using the BP table
specified by BPVER. The correction has five modes:
(a) if DOBAND=1 all entries for an antenna in the table
are averaged together before correcting the data.
(b) if DOBAND=2 the entry nearest in time (including
solution weights) is used to correct the data.
(c) if DOBAND=3 the table entries are interpolated in
time (using solution weights) and the data are then
corrected.
(d) if DOBAND=4 the entry nearest in time (ignoring
solution weights) is used to correct the data.
(e) if DOBAND=5 the table entries are interpolated in
time (ignoring solution weights) and the data are then
corrected.
BPVER......(multisource) specifies the version of the BP table
to be applied
plotted (if APARM(8)=2) or applied (if DOBAND > 0
and APARM(8) .NE. 2). 0 => highest numbered table.
<0 => no bandpass correction to be applied.
SMOOTH.....Specifies the type of spectral smoothing to be applied to
a uv database . The default is not to apply any smoothing.
The elements of SMOOTH are as follows:
SMOOTH(1) = type of smoothing to apply: 0 => no smoothing
To smooth before applying bandpass calibration
1 => Hanning, 2 => Gaussian, 3 => Boxcar, 4 => Sinc
To smooth after applying bandpass calibration
5 => Hanning, 6 => Gaussian, 7 => Boxcar, 8 => Sinc
SMOOTH(2) = the "diameter" of the function, i.e. width
between first nulls of Hanning triangle and sinc
function, FWHM of Gaussian, width of Boxcar. Defaults
(if < 0.1) are 4, 2, 2 and 3 channels for SMOOTH(1) =
1 - 4 and 5 - 8, resp.
SMOOTH(3) = the diameter over which the convolving
function has value - in channels. Defaults: 1,3,1,4
times SMOOTH(2) used when input SMOOTH(3) < net
SMOOTH(2).
DPARM......Control info:
1) controls the type of information to be printed:
0 => amplitude, 1 => phase, 2 => RMS of
amplitude.
2) controls the type of averaging:
0 => vector average,
1 => amp scalar averaging. Amplitudes and phases
averaged separately.
3) The number of digits per column for column
based listings. The allowed range is 5 to 7 for
amplitude and 5 to 9 for phase. The default value
is 5 in both cases. Phase quantities will be
printed in decimal form for column widths
greater than 6.
4) Averaging time in min.
DOCRT......False (<= 0) use the line printer if OUTPRINT = ' '
else write named OUTPRINT file only.
When OUTPRINT is not blank, DOCRT=-2 suppresses the
page-feed character on page headers and DOCRT=-3
suppresses page headers and most other header
information. When OUTPRINT is blank, the line
printer will be used. SHOUV now counts the lines
to be printed before printing any and asks for
permission to continue if the count > 500.
True (> 0) use the terminal interactively. The task will
use the actual terminal width as a display limit
unless 72 < DOCRT < width. In that case, the display
limit will be DOCRT characters.
OUTPRINT...Disk file name in which to save the line printer output.
' ' => use scratch and print immediately for interactive
jobs - batch jobs use OUTPRINT = 'PRTFIL:BATCHjjj.nnn'
(jjj= job #, nnn = user #). When OUTPRINT is not blank,
multiple outputs are concatenated, and the file is not
actually printed.
BADDISK....Disk numbers to avoid for scratch files. Scratch
files may be created by the sorting routines if
calibration or flagging is applied.
EXPLAIN SECTION
SHOUV: Task to list uv data.
DOCUMENTOR: Bill Cotton NRAO/CV
RELATED PROGRAMS: LISTR, UVFLG
PURPOSE
SHOUV is designed to display uv data in line printer listing form
as an aid in evaluating and editing data; several methods of
displaying the data are provided. SHOUV should work on both single
and multi-source data files.
The standard adverbs for calibration and editing (e.g. applying
CL, BL and FG tables to the data etc.) are provided.
COMMENTS
OPTYPE:
OPTYPE='CLOS' requests a column listing of the "closure phase"
for one or more triplets of antennas. For example the closure phase
of the triplet 1-2-3 is:
Phase_1-2 - Phase_1-3 + Phase_2-3
This value is independent of atmospheric or geometric errors in the
interferometer model and is useful for detecting either errors in the
correlator (when used on calibrator source data) or for source
resolution. Averaging is done before forming the closure phases. All
spectral channels (BCHAN through ECHAN) and IFs (BIF though EIF) are
included in the average used to form the closure phase.
The closure phase triplets are defined by the entries in array
ANTENNAS takes as triplets; up to 16 triplets may thus be requested.
For example:
ANTENNAS=1,2,3, 6,7,8, 2,3,5
requests the triplets 1-2-3, 6-7-8 and 2-3-5.
OPTYPE='SPEC' requests column listings of the amplitude of
phase of the baseline selected by the first two elements of
ANTENNAS. Only channels/IF selected by BCHAN,ECHAN,BIF,EIF will
be displayed. ANTENNAS=5,10 selects baseline 5-10
OPTYPE='AVIF' is like 'SPEC' except that all channels in
each IF are averaged first.
DPARM:
Control Information.
(1) specifies the type of information to be listed:
0 => amplitude of the visibility,
1 => phase of the visibility,
2 => RMS of amplitude.
(2) specifies the type of averaging:
0 => vector averaging of the selected visibilities before
conversion to amplitude or phase.
1 => "amp-scalar" averaging; amplitudes and phases are
computed for the individual visibilities and averaged.
(3) specifies the number of digits per column in the output to
be used for each value listed. The allowed range is 5 to
7 for amplitude and 5 to 9 for phase; the default in both cases
is 5. Phase quantities will be printed in decimal form for
column widths greater than 6.
(4) specifies the averaging time in minutes.