Basic Information on varplot

Task: varplot
Purpose: Plot uv variables
Categories: uv analysis, plotting

VARPLOT makes X,Y plots selected variables from a uv data set.
Only integer, real, and double precision variables maybe plotted.
When curser is in the plot window, the following keys are active:
   x - expand window in X to give one column of plots
   y - expand window in Y to give one row of plots
   z - expand window in both X and Y to show only one plot
   n - step to "next" plot in x or y or both depending on expansion
   q - quit the program
   ? - a little reminder

Key: vis
This is the normal keyword for an input visibility dataset. There
is generally no default input name. Some tasks allow multiple input
datasets (with wildcards supported, such as an asterisk). Other tasks
can handle only a single dataset at a time.
Only one file can be processed. No default.

Key: device
This keyword is used to specify the plotting device. It uses
the normal PGPLOT format of

  file/type

 or

  device/type

Usually there exists a default file name or device name.
The part after the slash gives the plotter type. Examples of the
type are:

  xs    X-windows output. This window is resizeable and
        persistent. Prepending a number allows you to use multiple
        windows, e.g. 1/xs, 2/xs etc.
  xd    X-windows output. A transient window that disappears
        when your task exists.
  ps    Postscript (landscape mode).
  vps   Postscript (portrait mode).
  cps   Color postscript (landscape mode).
  gif   gif files. Only supported with g77, not gfortran.
  vcps  Color postscript (portrait mode).
  tek   Tektronix 4010 or equivalent.
  xterm Xterm window (better for simple plots over slow X links).

A `?' as device name generates a complete list of the recognized
types (which will most likely vary from system to system).

Files created for hardcopy devices must be spooled to the printer
separately. The command needed for this is site and device specific.
Default: ?

Key: xaxis
Name of uv variable to be plotted along x-axis. 
Default: ut.

Key: yaxis
Name of uv variable to be plotted along y-axis. 
No default.

Key: options
Extra processing options. Several can be given, separated by
commas. They can be abbreviated to uniqueness.
  single    Plot all the data on a single plot. By default, many
            plots are made.
  compress  Compress variables along their second dimension. This
            is only particularly useful for systemp, where the
            second axis is the spectral window axis. Default is
            not to compress.

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