AIPS HELP file for CORER in 31DEC24
As of Fri Apr 26 22:39:33 2024
CORER: Task to calculate correlator stats and flag bad ones
INPUTS
INNAME Input UV file name (name)
INCLASS Input UV file name (class)
INSEQ 0.0 9999.0 Input UV file name (seq. #)
INDISK 0.0 9.0 Input UV file disk unit #
SOURCES Source name
QUAL -10.0 Calibrator qualifier -1=>all
CALCODE Calibrator code ' '=>all
TIMERANG Time range to use
SELBAND Bandwidth to select (kHz)
SELFREQ Frequency to select (MHz)
FREQID Freq. ID to select.
SUBARRAY 0.0 1000.0 Sub-array
BIF Low IF number to do
EIF Highest IF number to do
BCHAN 0.0 First channel included
ECHAN 0.0 last channel included
DOCALIB -1.0 101.0 > 0 calibrate data & weights
> 99 do NOT calibrate weights
GAINUSE CL (or SN) table to apply
DOPOL -1.0 10.0 If >0.5 correct polarization.
PDVER PD table to apply (DOPOL>0)
BLVER BL table to apply.
FLAGVER Flag table version: input
DOBAND -1.0 10.0 If >0.5 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.
UVRANGE 0.0 Range of projected spacings
in kilowavelengths
OUTFGVER Output flag version
DOOUTPUT -1.0 1.0 > 0 => write flagged output
OUTNAME Output UV file name (name)
OUTCLASS Output UV file name (class)
OUTSEQ -1.0 9999.0 Output UV file name (seq. #)
OUTDISK 0.0 9.0 Output UV file disk unit #.
DOCRT -3.0 132.0 > 0 => print on terminal
> 72 => terminal width
OUTPRINT
Printer disk file to save
PRTLEV 0.0 0 => summary, >0 => a lot
CPARM 0.0 (1) Print flag IPOL points
having mean > CPARM(1)
times expected error in
mean. <= 0 => 5.0.
(2) As (1) for cross POLs.
(3) = ok IPOL rms in Jy, bad
ones printed & deleted,
0 => 1.0E9
(4) As (3) for cross POLs.
(5) = Flux of point source to
subtract (IPOL)
BADDISK Disks to avoid for scratch
HELP SECTION
CORER
Task: Task to determine mean, rms, max, and min for all selected
correlators from a selected sub-set of a UV data base. Data
are printed and deleted only if their mean exceed some multiple
of the expected errors in the mean or if their rms is
excessive. Deletion is via an output flag table or via the
writing of a new data set and the bad data may be printed fully
and/or summarized.
Adverbs:
INNAME.....Input UV file name (name). Standard defaults.
INCLASS....Input UV file name (class). Standard defaults.
INSEQ......Input UV file name (seq. #). 0 => highest.
INDISK.....Disk drive # of input UV file. 0 => any.
SOURCES....Sources to be included if average. ' '=> all; if any
starts with a '-' then all except ANY source named.
QUAL.......Qualifier of source to be averaged. -1 => all.
CALCODE....Calibrator code of sources to averagde. ' '=> all.
TIMERANG...Time range of the data to be copied. In order: Start day,
hour, min. sec, end day, hour, min. sec. Days relative to
ref. date.
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. For data which contain multiple
bandwidths/frequencies the task will insist that some form
of selection be made by frequency or bandwidth.
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.
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
override that of FREQID. However, setting SELBAND and
SELFREQ may result in an ambiguity. In that case, the task
will request that you use FREQID.
SUBARRAY...Sub-array number to examine. 0 => 1.
BIF........First IF to include. 0 -> 1.
EIF........Last IF to include. 0 -> max.
BCHAN......First channel to examine. 0=>all.
ECHAN......Highest channel to examine. 0=>all higher than BCHAN
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 CL table to apply to multi-source
files or the SN table for single source files.
0 => highest.
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 apply. <0 => apply no BL table, 0 => highest.
FLAGVER....specifies the version of the flagging table to be applied.
0 => highest numbered table.
<0 => no flagging to be applied.
DOBAND.....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......Specifies the version of the BP table to be applied
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).
UVRANGE....Print and flag only data having projected spacing between
UVRANGE(1) and UVRANGE(2) in kilowavelengths. 0 => all.
Tnis option requires two passes through the data and can
produce very large FG tables when OUTFGVER > 0.
OUTFGVER...< 0 => do not write an FG table. Note that flag tables
may become very large when UVRANGE is not zero.
>= 0 => write an FG table attached to the input file of
version OUTFGVER. If DOOUTPUT <= 0 and OUTFGVER is = 0
or greater than FGmax (the previously highest FG version
number), then a new FG table will be created for the new
flags with version FGmax+1. This new table will also
contain the flags applied on input (if any) from FG
version FLAGVER. If OUTFGVER specifies a pre-existing FG
version, then the input flags are not copied even if
OUTFGVER and FLAGVER are not equal.
DOOUTPUT...> 0 => write the flagged data in an output file. If
OUTFGVER > 0, then DOOUTPUT is set to -1.
<= 0 => do printing and, optionally, write an FG table.
OUTNAME....Output UV file name (name). Standard defaults.
OUTCLASS...Output UV file name (class). Standard defaults.
OUTSEQ.....Output UV file name (seq. #). 0 => highest unique
OUTDISK....Disk drive # of output UV file. 0 => highest with
space for the file.
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.
Zero => do no printed output.
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.
PRTLEV.....<= 0 -> summary printout including number baselines
flagged by channel and IF and, for spectral data,
number of channels flagged by baseline and IF
> 0 -> show full details
CPARM......CPARM(1) Print and flag IPOL correlators having mean >
CPARM(1) * the expected error in the mean.
The expected error in the mean is the actual rms
of that correlator (Real and Imaginary parts
separately) as determined by CORER divided by
the square root of the number of samples - 1 in
the mean. 0 => 5
CPARM(2) As CPARM(1) for cross polarizations.
CPARM(3) = IPOL cutoff level in the rms (Jy). Print and
flag all data having rms > CPARM(3). 0 -> 1E9
CPARM(4) As CPARM(3) for cross polarizations.
CPARM(5) = flux of unpolarized point source at the
origin to be subtracted before summing things.
BADDISK....The disk numbers to avoid for scratch files (sorting
tables mostly).
EXPLAIN SECTION