AIPS NRAO AIPS HELP file for FLAGVER in 31DEC20



As of Mon Sep 21 9:43:50 2020



HELP SECTION

FLAGVER
Type: Adverb  (Scalar)
Use:  Standard data selection adverb; used to specify the version
      number of the flagging (FG) table to be applied.  If FLAGVER <
      0, then NO flag table is applied.  This adverb is only relevant
      when the data being operated on has an associated flag (FG)
      table.

      A flag table may be applied to single-source or multi-source
      data sets and may be applied to data which are not in time
      order.  If data are in time order, then flagging will work so
      long as no more than 60000 flags apply to any one time.  If the
      data are not in time order, then flagging works only if no more
      than 60000 flags apply to the current data.  If you exceed these
      limits, you may run UVCOP to apply the FG table so long as you
      are within limits 10 times larger.

      If this adverb is not in the inputs of a particular verb or
      task, then that verb or task does NOT apply flagging.

Null value:  0 => different for different tasks.
                  Normally means use the highest numbered flag table.
                  In UVCOP it means do no flagging.
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:
   CRSFRING......Procedure to calibrate cross pol. delay and phase
                 offsets.
   FXALIAS.......Least squares fit aliasing function and remove.
   LINIMAGE......Build image cube from multi-IF data set.
   STUFFR........Averages together data sets in hour angle.
   VLACALIB......Runs CALIB and LISTR for VLA observation.
   VLBACPOL......Procedure to calibrate cross-polarization delays.
Tasks:
   ACCOR.........Corrects cross amplitudes using auto correlation
                 measurements.
   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.
   BLAVG.........Average cross-polarized UV data over baselines.
   BLCAL.........Compute closure offset corrections.
   BLCHN.........Compute closure offset corrections on a
                 channel-by-channel basis.
   BLING.........Find residual rate and delay on individual baselines.
   BPASS.........Computes spectral bandpass correction table.
   BPEDT.........Interactive TV task to edit uv data based on BP tables.
   BPFLG.........Flgas uv data based on bad BP values.
   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, ..
   BSGRD.........Task to image beam-switched single-dish data.
   CALIB.........Determines antenna calibration: complex gain.
   CAPLT.........Plots closure amplitude and model from CC file.
   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.
   EDITA.........Interactive TV task to edit uv data based on TY/SY/SN/CL
                 tables.
   EDITR.........Interactive baseline-oriented visibility editor using the
                 TV.
   EVAUV.........Subtracts & divides a model into UV data, does statistics
                 on results.
   FGCNT.........Counts samples comparing two flag tables.
   FGDIF.........Compares affect of 2 FG tables.
   FGSPW.........Flags bad spectral windows.
   FINDR.........Find normal values for a uv data set.
   FIXAL.........Least squares fit aliasing function and remove.
   FIXWT.........Modify weights to reflect amplitude scatter of data.
   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.
   FTFLG.........Interactive flagging of UV data in channel-time using the
                 TV.
   FUDGE.........Modifies UV data with user's algorithm: paraform task.
   IBLED.........Interactive BaseLine based visibility EDitor.
   IMAGR.........Wide-field and/or wide-frequency Cleaning / imaging task.
   KRING.........Fringe fit data to determine antenna calibration, delay,
                 rate.
   LISTR.........Prints contents of UV data sets and assoc. calibration
                 tables.
   LPCAL.........Determines instrumental polarization for UV data.
   MAPBM.........Map VLA beam polarization.
   NOIFS.........Makes all IFs into single spectrum.
   OBEDT.........Task to flag data of orbiting antennas.
   OFLAG.........Uses on-line flag table information to write a flag
                 table.
   OMFIT.........Fits sources and, optionally, a self-cal model to uv
                 data.
   PCAL..........Determines instrumental polarization for UV data.
   PCVEL.........Shifts spectral-line UV data to a given velocity: planet
                 version.
   PDEDT.........Interactive TV task to edit polarization D-term (PD)
                 tables.
   PHSRF.........Perform phase-referencing within a spectral line
                 database.
   POSSM.........Task to plot total and cross-power spectra.
   PRTSD.........Prints contents of AIPS single-dish data sets.
   PRTSY.........Task to print statistics from the SY table.
   QUACK.........Flags beginning or end portions of UV-data scans.
   REFLG.........Attempts to compress a flag 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).
   RLDIF.........Determines Right minus Left phase difference, corrects
                 cal files.
   RLDLY.........Fringe fit data to determine antenna R-L delay
                 difference.
   SCIMG.........Full-featured imaging plus self-calibration loop with
                 editing.
   SCMAP.........Imaging plus self-calibration loop with editing.
   SDCAL.........Task to apply single dish calibration.
   SDGRD.........Task to select and image random-position single-dish
                 data.
   SDIMG.........Task to select and image random-position single-dish
                 data.
   SDVEL.........Shifts spectral-line single-dish data to a given
                 velocity.
   SHOUV.........Displays uv data in various ways.
   SNEDT.........Interactive SN/CL/TY/SY table editor using the TV.
   SNFLG.........Writes flagging info based on the contents of SN files.
   SPCAL.........Determines instrumental polzn. for spec. line UV data.
   SPFLG.........Interactive flagging of UV data in channel-TB using the
                 TV.
   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.
   SYSOL.........Undoes and re-does nominal sensitivity application for
                 Solar data.
   TACOP.........Task to copy tables, other extension files.
   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.
   TVFLG.........Interactive flagging of UV data using the TV.
   TYAPL.........Undoes and re-does nominal sensitivity application.
   TYSMO.........Smooths and filters a calibration TY or SY table.
   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.
   UVFIT.........Fits source models to 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.
   UVGIT.........Fits source models to uv data.
   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.
   UVIMG.........Grid UV data into an "image".
   UVLIN.........Fits and removes continuum visibility spectrum, also can
                 flag.
   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.
   VLAMP.........Makes ANTAB file for phased VLA used in VLBI
                 observations.
   VPLOT.........Plots uv data and model from CC file.
   WETHR.........Plots selected contents of WX tables, flags data based on
                 WX.
   WIPER.........Plots and edits data from a UV data base using the TV.
   XYDIF.........Find/apply X minus Y linear polarization phase
                 difference.
   XYMOD.........Compute linear polarization point source model, applies
                 to data.

EXPLAIN SECTION


AIPS