; UVRANGE
;---------------------------------------------------------------
;! Specify range of projected baselines
;# ADVERB UV
;-----------------------------------------------------------------------
;;  Copyright (C) 1995, 2018, 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
;-----------------------------------------------------------------------
;---------------------------------------------------------------
UVRANGE   LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC
----------------------------------------------------------------
UVRANGE
Type:  Adverb (Real array, 2 elements)
Use:  Specify minimum and maximum projected baselines to include.
      Units are kilolambda.  Before May 2018, this cutoff was applied
      in wavelengths at the header frequency.  Since the header
      frequency is normally in spectral window 1 at the low end of the
      spectrum, this cutoff could include data at projected spacings
      substantially larger than UVRANGE(2).

      In the 2018 release, after May 2018, this option is now applied
      using the reference frequency of each spectral window
      individually.  Therefore, it is now possible that only some of
      the spectral windows from a particular visibility sample will be
      included.  Note that the change of frequency within a spectral
      window can still cause some data to be included a little bit
      outside the UVRANGE(1) to UVRANGE(2) range.

Null Value: 0
      Null value means use all of the data.

Procedures:
   CXPOLN........Procedure to make complex polarization images and beam.
   DOOSRO........Calibrating amplitude and phase, and imaging VLA data.
   IMFRING.......Large image delay fitting with IM2CC and OOFRING.
   IMSCAL........Large image self-cal with IM2CC and OOCAL.
   LINIMAGE......Build image cube from multi-IF data set.
   OOCAL.........Determines antenna complex gain with frequency-dependent
                 models.
   OOFRING.......Fringe fit data to determine calibration with spectral
                 index options.
   PIPEAIPS......Calibrating amplitude and phase, and imaging VLA data.
   VLACALIB......Runs CALIB and LISTR for VLA observation.
   VLARUN........Calibrating amplitude and phase, and imaging VLA data.
Tasks:
   ACLIP.........Edits suto-corr data for amplitudes, phases, and weights
                 out of range.
   ANBPL.........Plots and prints uv data converted to antenna based
                 values.
   BLING.........Find residual rate and delay on individual baselines.
   BPASS.........Computes spectral bandpass correction table.
   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.
   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.
   EDITR.........Interactive baseline-oriented visibility editor using the
                 TV.
   FINDR.........Find normal values for a uv data set.
   FLAGR.........Edit data based on internal RMS, amplitudes, weights.
   FRCAL.........Faraday rotation self calibration task.
   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.
   IBLED.........Interactive BaseLine based visibility EDitor.
   IM2UV.........Converts an image to a visibility data set.
   IMAGR.........Wide-field and/or wide-frequency Cleaning / imaging task.
   IMERG.........Merges images of different spatial resolutions.
   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.
   OMFIT.........Fits sources and, optionally, a self-cal model to uv
                 data.
   PCAL..........Determines instrumental polarization for UV data.
   POSSM.........Task to plot total and cross-power spectra.
   PRTUV.........Prints contents of a visibility (UV) data set.
   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.
   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.
   SPRMS.........Plots spectral statistics of a selected subset of a uv
                 data set.
   TVFLG.........Interactive flagging of UV data using the TV.
   UFLAG.........Plots and edits data using a uv-plane grid and the TV.
   UVCOP.........Task to copy a subset of a UV data file.
   UVDIF.........Prints differences between two UV data sets.
   UVFIT.........Fits source models to 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".
   UVMAP.........Makes images from calibrated UV data.
   UVNOU.........Flags uv samples near the U,V  axes to reduce
                 interference.  UVRANGE gives the minimum U and V in
                 wavelengths.
   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.
   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.
   XYDIF.........Find/apply X minus Y linear polarization phase
                 difference.
----------------------------------------------------------------
