; QUAL
;---------------------------------------------------------------
;! Source qualifier
;# ADVERB CATALOG GENERAL UV
;-----------------------------------------------------------------------
;;  Copyright (C) 1995, 2020
;;  Associated Universities, Inc. Washington DC, USA.
;;
;;  This program is free software; you can redistribute it and/or
;;  modify it under the terms of the GNU General Public License as
;;  published by the Free Software Foundation; either version 2 of
;;  the License, or (at your option) any later version.
;;
;;  This program is distributed in the hope that it will be useful,
;;  but WITHOUT ANY WARRANTY; without even the implied warranty of
;;  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;  GNU General Public License for more details.
;;
;;  You should have received a copy of the GNU General Public
;;  License along with this program; if not, write to the Free
;;  Software Foundation, Inc., 675 Massachusetts Ave, Cambridge,
;;  MA 02139, USA.
;;
;;  Correspondence concerning AIPS should be addressed as follows:
;;         Internet email: aipsmail@nrao.edu.
;;         Postal address: AIPS Project Office
;;                         National Radio Astronomy Observatory
;;                         520 Edgemont Road
;;                         Charlottesville, VA 22903-2475 USA
;-----------------------------------------------------------------------
;---------------------------------------------------------------
QUAL      LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC
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QUAL
Type: Adverb   (Real)
Use: To specify the source qualifier to select the desired data.
     This attribute is no longer used in most cases.
Null value:   -1
     Null value assignment means select all values of QUAL.

Verbs:
   OBITIMAG......Access to OBIT task Imager without self-cal or peeling.
   OBITPEEL......Access to OBIT task Imager with self-cal and peeling.
   OBITSCAL......Access to OBIT task Imager with self-cal, NOT peeling.
Procedures:
   LINIMAGE......Build image cube from multi-IF data set.
   VLACALIB......Runs CALIB and LISTR for VLA observation.
   VLACLCAL......Runs CLCAL and prints the results with LISTR.
Tasks:
   ACFIT.........Determine antenna gains from autocorrelations.
   ACLIP.........Edits suto-corr data for amplitudes, phases, and weights
                 out of range.
   ACSCL.........Corrects cross amplitudes using auto correlation
                 measurements.
   ALVAR.........Plots the Allan Variance statistic of a UV data set.
   ALVPR.........Prints statistics on the Allan Variance of a UV data set.
   ANBPL.........Plots and prints uv data converted to antenna based
                 values.
   AVSPC.........Averages uv-data in the frequency domain.
   BLING.........Find residual rate and delay on individual baselines.
   BPASS.........Computes spectral bandpass correction table.
   BPWAY.........Determines channel-dependent relative weights.
   BPWGT.........Calibrates data and scales weights by bandpass
                 correction.
   BSCAN.........Seeks best scan to use for phase cal, fringe search, ..
   CALIB.........Determines antenna calibration: complex gain.
   CAPLT.........Plots closure amplitude and model from CC file.
   CLCAL.........Merges and smooths SN tables, applies them to CL tables.
   CLIP..........Edits data based on amplitudes, phases, and weights out
                 of range.
   CLPLT.........Plots closure phase and model from CC file.
   CORER.........Calculates correlator statistics and flags bad ones.
   CPASS.........Computes polynomial spectral bandpass correction table.
   CVEL..........Shifts spectral-line UV data to a given velocity.
   DECOR.........Measures the decorrelation between channels and IF of uv
                 data.
   DEFLG.........Edits data based on decorrelation over channels and time.
   DFTIM.........Makes image of DFT at arbitrary point showing time vs
                 frequency.
   DFTPL.........Plots DFT of a UV data set at arbitrary point versus
                 time.
   DIFRL.........Divides the RR data by LL data.
   DTSUM.........Task to provide a summary of the contents of a dataset.
   EDITR.........Interactive baseline-oriented visibility editor using the
                 TV.
   ELFIT.........Plots/fits selected contents of SN, TY, SY, PC or CL
                 files.
   ELINT.........Determines and removes gain dependence on elevation.
   EVASN.........Evaluates statistics in SN/CL tables.
   EVAUV.........Subtracts & divides a model into UV data, does statistics
                 on results.
   FGCNT.........Counts samples comparing two flag tables.
   FGSPW.........Flags bad spectral windows.
   FILLM.........Reads VLA on-line/archive format uv data tapes (post Jan
                 88).
   FILLR.........Reads old VLA on-line-system tapes into AIPS.
   FINDR.........Find normal values for a uv data set.
   FITLD.........Reads FITS files to load images or UV (IDI or UVFITS)
                 data to disk.
   FLAGR.........Edit data based on internal RMS, amplitudes, weights.
   FLGIT.........Flags data based on the rms of the spectrum.
   FLOPM.........Reverses the spectral order of UV data, can fix VLA
                 error.
   FRING.........Fringe fit data to determine antenna calibration, delay,
                 rate.
   FRMAP.........Task to build a map using fringe rate spectra.
   FRPLT.........Task to plot fringe rate spectra.
   FUDGE.........Modifies UV data with user's algorithm: paraform task.
   GETJY.........Determines calibrator flux densities.
   IMAGR.........Wide-field and/or wide-frequency Cleaning / imaging task.
   KRING.........Fringe fit data to determine antenna calibration, delay,
                 rate.
   MAPBM.........Map VLA beam polarization.
   NOIFS.........Makes all IFs into single spectrum.
   PCAL..........Determines instrumental polarization for UV data.
   PCVEL.........Shifts spectral-line UV data to a given velocity: planet
                 version.
   PHSRF.........Perform phase-referencing within a spectral line
                 database.
   POSSM.........Task to plot total and cross-power spectra.
   PROFL.........Generates plot file for a profile display.
   PRTSY.........Task to print statistics from the SY table.
   REWAY.........Computes weights based in rms in spectra.
   RFI...........Look for RFI in uv data.
   RFLAG.........Flags data set based on time and freq rms in fringe
                 visibilities.
   RLCAL.........Determines instrumental right-left phase versus time (a
                 self-cal).
   RLDLY.........Fringe fit data to determine antenna R-L delay
                 difference.
   SETJY.........Task to enter source info into source (SU) table.
   SNBLP.........Plots selected contents of SN or CL files on a baseline
                 basis.
   SNFIT.........Fits parabola to SN amplitudes and plots result.
   SNFLG.........Writes flagging info based on the contents of SN files.
   SNIFS.........Plots selected contents of SN, TY, SY, PC or CL files by
                 IF.
   SNPLT.........Plots selected contents of SN, SY, TY, PC or CL files
                 versus time.
   SOUSP.........Fits source spectral index from SU table or adverbs.
   SPLAT.........Applies calibration and splits or assemble selected
                 sources.
   SPLIT.........Converts multi-source to single-source UV files w
                 calibration.
   SPMOD.........Modify UV database by adding a model with spectral lines.
   SPRMS.........Plots spectral statistics of a selected subset of a uv
                 data set.
   SUFIX.........Modifies source numbers on uv data.
   SWAPR.........Modifies UV data by swapping real and imaginary parts.
   SYPRT.........Task to print values from the SY table.
   SYVSN.........Plots selected SY/TY data with SN solution values versus
                 time.
   TI2HA.........Modifies times in UV data to hour angles.
   TIORD.........Checks data for time baseline ordering, displays
                 failures.
   TRUEP.........Determines true antenna polarization from special data
                 sets.
   UFLAG.........Plots and edits data using a uv-plane grid and the TV.
   UV2MS.........Append single-source file to multi-source file.
   UV2TB.........Converts UV autocorrelation spectra to tables.
   UVAVG.........Average or merge a sorted (BT, TB) uv database.
   UVBAS.........Averages several channels and subtracts from uv data.
   UVCOP.........Task to copy a subset of a UV data file.
   UVFLG.........Flags UV-data.
   UVFND.........Prints selected data from UV data set to search for
                 problems.
   UVFRE.........Makes one data set have the spectral structure of
                 another.
   UVHGM.........Plots statistics of uv data files as histogram.
   UVHIM.........Makes image of the histogram on two user-chosen axes.
   UVHOL.........Prints holography data from a UV data base with
                 calibration.
   UVLIN.........Fits and removes continuum visibility spectrum, also can
                 flag.
   UVLOD.........Read export or FITS data from a tape or disk.
   UVLSD.........Least squares fit to channels and divides the uv data.
   UVLSF.........Least squares fit to channels and subtracts from uv data.
   UVMLN.........Edits data based on the rms of the spectrum.
   UVMOD.........Modify UV database by adding a model incl spectral index.
   UVMTH......... Averages one data set and applied it to another.
   UVPLT.........Plots data from a UV data base in multiple ways.
   UVPRM.........Measures parameters from a UV data base.
   UVPRT.........Prints data from a UV data base with calibration.
   UVRFI.........Mitigate RFI by Fourier transform or fitting the circle.
   UVRMS.........Computes statistics of a selected subset of a uv data
                 set.
   VPLOT.........Plots uv data and model from CC file.
   WIPER.........Plots and edits data from a UV data base using the TV.
   XYMOD.........Compute linear polarization point source model, applies
                 to data.
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