AIPS HELP file for ECHAN in 31DEC24
As of Mon Apr 29 5:14:11 2024
HELP SECTION
ECHAN
Type: Adverb (scalar)
Use: To set an ending "channel" number, where the
definition of channel will depend on the particular
verb or task.
Null value:
0 => maximum possible value.
Verbs:
OBITIMAG......Access to OBIT task Imager without self-cal or peeling.
OBITMAP.......Simplified access to OBIT task Imager.
OBITPEEL......Access to OBIT task Imager with self-cal and peeling.
OBITSCAL......Access to OBIT task Imager with self-cal, NOT peeling.
REMOVIE.......Verb to rerun a previously loaded (TVMOVIE) movie.
Procedures:
CXIMAGR.......Grid UV data into a complex image, Fourier transform,
Clean.
CXPOLN........Procedure to make complex polarization images and beam.
FXALIAS.......Least squares fit aliasing function and remove.
IMFRING.......Large image delay fitting with IM2CC and OOFRING.
LINIMAGE......Build image cube from multi-IF data set.
MAPPR.........Simplified access to IMAGR.
OOFRING.......Fringe fit data to determine calibration with spectral
index options.
PEELR.........Calibrates interfering sources in multi-facet imges.
VLBAFRGP......Fringe fit phase referenced data and apply calibration.
VLBAFRNG......Fringe fit data and apply calibration.
VLBAKRGP......Fringe fit phase referenced data and apply calibration.
VLBAKRNG......Fringe fit data and apply calibration.
VLBAMPCL......Calculates and applies manual instrumental phase
calibration.
Tasks:
ACFIT.........Determine antenna gains from autocorrelations.
ACIMG.........Makes image of autocorrelation data showing time vs
frequency
ACLIP.........Edits suto-corr data for amplitudes, phases, and weights
out of range.
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.
AVGWT.........Computes the average visibility weight of the included
data.
BLANK.........Blanks out selected, e.g. non-signal, portions of an
image.
BLAVG.........Average cross-polarized UV data over baselines.
BLING.........Find residual rate and delay on individual baselines.
BPEPL.........Plots bandpass tables overlaying multiple times like
BPEDT.
BPFLG.........Flgas uv data based on bad BP values.
BPLOT.........Plots bandpass tables in 2 dimensions as function of
time.
BPPLT.........Plots selected contents of bandpass (BP) files versus
time.
BPSMO.........Smooths or interpolates bandpass tables to regular times.
BPWGT.........Calibrates data and scales weights by bandpass
correction.
BSCAN.........Seeks best scan to use for phase cal, fringe search, ..
BSTST.........Graphical display of solutions to frequency-switched
data.
CAPLT.........Plots closure amplitude and model from CC file.
CLIP..........Edits data based on amplitudes, phases, and weights out
of range.
CLOSE.........Plots closure phase or amplitude spectra averaged over
closures.
CLPLT.........Plots closure phase and model from CC file.
COHER.........Baseline Phase coherence measurement.
CORER.........Calculates correlator statistics and flags bad ones.
CPASS.........Computes polynomial spectral bandpass correction table.
DECOR.........Measures the decorrelation between channels and IF of uv
data.
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.
EVACL.........Evaluates statistics in closure phase and amplitude.
EVAUV.........Subtracts & divides a model into UV data, does statistics
on results.
FGCNT.........Counts samples comparing two flag tables.
FGPLT.........Plots selected contents of FG table.
FGPRT.........Pprints counts of selected portions of an FG table.
FGSPW.........Flags bad spectral windows.
FILLM.........Reads VLA on-line/archive format uv data tapes (post Jan
88).
FINDR.........Find normal values for a uv data set.
FITLD.........Reads FITS files to load images or UV (IDI or UVFITS)
data to disk.
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.
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.
MORIF.........Combines IFs or breaks spectral windows into multiple
windows (IFs).
NOIFS.........Makes all IFs into single spectrum.
OMFIT.........Fits sources and, optionally, a self-cal model to uv
data.
OTFUV.........Translates on-the-fly single-dish SDD format to AIPS UV
file.
PCPLT.........Plots pulse-cal tables in 2 dimensions as function of
time.
PDPLT.........Plots selected contents of PD tables.
PLOTC.........Plots color schems used by 3-color plot tasks.
PLRFI.........Plots spectral statistics from output of VBRFI & VLBRF
POSSM.........Task to plot total and cross-power spectra.
REIFS.........Breaks spectral windows into multiple spectral windows
(IFs).
RFI...........Look for RFI in uv data.
RIRMS.........Computes rms of real/imag of a selected subset of a uv
data set
RLDIF.........Determines Right minus Left phase difference, corrects
cal files.
RLDLY.........Fringe fit data to determine antenna R-L delay
difference.
SBCOR.........Task to correct VLBA data for phase shift between USB &
LSB.
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.
SDMOD.........Modifies single-dish UV data with model sources.
SERCH.........Finds line signals in transposed data cube.
SHOUV.........Displays uv data in various ways.
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.
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.
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.
UVDEC.........Decrements the number of spectral channels, keeping every
nth.
UVFIT.........Fits source models to uv data.
UVFLG.........Flags UV-data.
UVFND.........Prints selected data from UV data set to search for
problems.
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.
UVIMG.........Grid UV data into an "image".
UVLSD.........Least squares fit to channels and divides the uv data.
UVLSF.........Least squares fit to channels and subtracts from uv data.
UVMOD.........Modify UV database by adding a model incl spectral index.
UVPLT.........Plots data from a UV data base in multiple ways.
UVRFI.........Mitigate RFI by Fourier transform or fitting the circle.
UVRMS.........Computes statistics of a selected subset of a uv data
set.
VBRFI.........Plots spectral statistics of VLBA autocorrelation data
for RFI.
VH2RL.........Converts from linear to circular polarization and vice
versa.
VLBIN.........Task to read VLBI data from an NRAO/MPI MkII correlator.
VLBRF.........Plots spectral statistics of VLBA autocorrelation data
for RFI.
VPFLG.........Resets flagging to all or all corss-hand whenever some
are flagged.
VPLOT.........Plots uv data and model from CC file.
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