; DOTV
;---------------------------------------------------------------
;! selects use of TV display option in operation
;# ADVERB TV
;-----------------------------------------------------------------------
;;  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
;-----------------------------------------------------------------------
;---------------------------------------------------------------
DOTV      LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC
----------------------------------------------------------------
DOTV
Type: Adverb   (Logical,  > 0  =>  true)
Use:  If true, use of the TV is requested.  Additional meaning is
      attached to values > 1 by some tasks.  For example. XGAUS and
      friends use the TV for menus when DOTV is 2 and the terminal when
      DOTV is 1.  IMAGR chooses the initial facet to display by DOTV.
Null value:   false (<= 0)
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.
Procedures:
   LINIMAGE......Build image cube from multi-IF data set.
   MAPPR.........Simplified access to IMAGR.
   VLBACRPL......Plots crosscorrelations.
   VLBASNPL......Plots selected contents of SN or CL files.
Tasks:
   AGAUS.........Fits 1-dimensional Gaussians to absorption-line spectra.
   ALVAR.........Plots the Allan Variance statistic of a UV data set.
   ANBPL.........Plots and prints uv data converted to antenna based
                 values.
   APCAL.........Apply TY and GC tables to generate an SN table.
   APCLN.........Deconvolves images with CLEAN algorithm.
   APGS..........Deconvolves image with Gerchberg-Saxton algorithm.
   APVC..........Deconvolves images with van Cittert algorithm.
   BLPLT.........Plots BLCAL tables in 2 dimensions as function of
                 baseline and IF.
   BPEPL.........Plots bandpass tables overlaying multiple times like
                 BPEDT.
   BPERR.........Print and plot BPASS closure outputs.
   BPLOT.........Plots bandpass tables in 2 dimensions as function of
                 time.
   BSCLN.........Hogbom Clean on beam-switched difference image.
   BSTST.........Graphical display of solutions to frequency-switched
                 data.
   CAPLT.........Plots closure amplitude and model from CC file.
   CCNTR.........Generate a contour plot file from an image with CC or MF
                 plotted.
   CLPLT.........Plots closure phase and model from CC file.
   CNTR..........Generate a contour plot file or TV plot from an image.
   CONFI.........Optimize array configuration by minimum side lobes.
   CONPL.........Plots AIPS gridding convolution functions.
   DELZN.........Determines residual atmosphere depth at zenith and clock
                 errors.
   DFTPL.........Plots DFT of a UV data set at arbitrary point versus
                 time.
   ELFIT.........Plots/fits selected contents of SN, TY, SY, PC or CL
                 files.
   ELINT.........Determines and removes gain dependence on elevation.
   EVAUV.........Subtracts & divides a model into UV data, does statistics
                 on results.
   FGPLT.........Plots selected contents of FG table.
   FRMAP.........Task to build a map using fringe rate spectra.
   FRPLT.........Task to plot fringe rate spectra.
   GAL...........Determine parameters from a velocity field.
   GCPLT.........Plots gain curves from text files.
   GREYS.........Plots images as contours over multi-level grey.
   IMAGR.........Wide-field and/or wide-frequency Cleaning / imaging task.
   IMEAN.........Displays the mean & extrema and plots histogram of an
                 image.
   IMRMS.........Plot IMEAN rms answers.
   IMVIM.........Plots one image's values against another's.
   IRING.........Integrates intensity / flux in rings / ellipses.
   ISPEC.........Plots and prints spectrum of region of a cube.
   KNTR..........Make a contour/grey plot file from an image w multiple
                 panels.
   LOCIT.........Fits antenna locations from SN-table data.
   OBPLT.........Plot columns of an OB table.
   PANEL.........Convert HOLOG output to panel adjustment table.
   PBEAM.........Fits the analytic function to the measured values of the
                 beam.
   PCHIS.........Generates a histogram plot file from text input, e.g.
                 from PCRMS.
   PCNTR.........Generate plot file with contours plus polarization
                 vectors.
   PCPLT.........Plots pulse-cal tables in 2 dimensions as function of
                 time.
   PDPLT.........Plots selected contents of PD tables.
   PEEK..........Fits pointing model function to output from the VLA.
   PFPL1.........Paraform Task to generate a plot file: (does grey scale).
   PFPL2.........Paraform Task to generate a plot file: (slice intensity).
   PFPL3.........Paraform Task to generate a plot file: (does histogram).
   PLCUB.........Task to plot intensity vs x panels on grid of y,z pixels.
   PLOTC.........Plots color schems used by 3-color plot tasks.
   PLOTR.........Basic task to generate a plot file from text input.
   PLROW.........Plot intensity of a series of rows with an offset.
   POSSM.........Task to plot total and cross-power spectra.
   PROFL.........Generates plot file for a profile display.
   PRTAN.........Prints the contents of the ANtenna extension file.
   RFLAG.........Flags data set based on time and freq rms in fringe
                 visibilities.
   RM2PL.........Plots spectrum of a pixel with RMFIT fit.
   RMFIT.........Fits 1-dimensional polarization spectrum to Q/U cube.
   RSPEC.........Plots and prints spectrum of rms of a cube.
   SCIMG.........Full-featured imaging plus self-calibration loop with
                 editing.
   SCMAP.........Imaging plus self-calibration loop with editing.
   SDCLN.........Deconvolves image by Clark and then "SDI" cleaning
                 methods.
   SERCH.........Finds line signals in transposed data cube.
   SL2PL.........Task to convert a Slice File to a Plot File.
   SNBLP.........Plots selected contents of SN or CL files on a baseline
                 basis.
   SNFIT.........Fits parabola to SN amplitudes and plots result.
   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.
   SPRMS.........Plots spectral statistics of a selected subset of a uv
                 data set.
   STEER.........Task which deconvolves the David Steer way.
   SYVSN.........Plots selected SY/TY data with SN solution values versus
                 time.
   TAPLT.........Plots data from a Table extension file.
   TARPL.........Plot input and output text files of the TARS task.
   TVCPS.........Task to copy a TV screen-image to a PostScript file.
   UTESS.........Deconvolves images by maximizing emptiness.
   UVHGM.........Plots statistics of uv data files as histogram.
   UVHOL.........Prints holography data from a UV data base with
                 calibration.
   UVMAP.........Makes images from calibrated UV data.
   UVPLT.........Plots data from a UV data base in multiple ways.
   UVRMS.........Computes statistics of a selected subset of a uv data
                 set.
   VPLOT.........Plots uv data and model from CC file.
   VTESS.........Deconvolves sets of images by the Maximum Entropy Method.
   WETHR.........Plots selected contents of WX tables, flags data based on
                 WX.
   XBASL.........Fits and subtracts nth-order baselines from cube (x
                 axis).
   XG2PL.........Plots spectrum of a pixel with XGAUS/AGAUS and
                 ZEMAN/ZAMAN fits.
   XGAUS.........Fits 1-dimensional Gaussians to images: restartable.
   XPLOT.........Plots image rows one at a time on the graphics or TV
                 screen.
   ZAMAN.........Fits 1-dimensional Zeeman model to absorption-line data.
   ZEMAN.........Fits 1-dimensional Zeeman model to data.
----------------------------------------------------------------