Basic Information on uvtriple

Task: uvtriple
Purpose: Make phase or amplitude plots of the triple product from a
Categories: uv analysis, plotting

UVTRIPLE - Plot triple product phase or amplitude from visibility data
     bases. Options are available to time average data and to plot
     different triples on separate sub-plots on each page.

Key: vis
The input visibility file(s). Multiple input files and wild card
card expansion are supported.    
No default

Key: line
Line type of the data in the format
  type,nchan,start,width,step
Here "type" can be one of:  channel, wide or velocity
If you select more than one channel, they will all appear
on the plot.  If you want to average channels together,
then use WIDTH appropriately.
Default is channel,1,1,1,1

Key: select
This selects which visibilities to be used. Default is all
visibilities. See the Users Guide for information about how
to specify uv data selection.
Default is all data

Key: stokes
Select Stokes parameter(s) or polarization(s) from:
  xx, yy, xy, yx,  i, q, u, v, 
  rr, ll, rl, lr
Default is all polarizations or Stokes parameters present

Key: axis
Two values, one for each axis. Minimum match is active.
Values for the x-axis chosen from:
  time                     [DD HH MM SS.S format]
  dtime                    [decimal days  format]
Values for the y-axis chosen from:
  phase                    [degrees]
  amplitude                [natural units] 

Key: xrange
Plot range for the x-axis 
  If axis = time                  [dd,hh,mm,ss.s; 8 values]
  If axis = dtime                 [decimal days;  2 values]
Default is to self-scale (see also OPTIONS=XIND).

Key: yrange
Plot range for the y-axis 
  If axis = phase                 [degrees;       2 values]
  If axis = amplitude             [natural units; 2 values]
Default is to self-scale (see also OPTIONS=YIND).

Key: average
The averaging time in minutes.  Averaging is reset at frequency, 
source, or pointing centre changes.  Individual triples and 
polarizations are averaged separately (unless OPTIONS=AVALL).
If you have selected multiple channels and you also ask for 
time averaging, then all the selected channels are averaged 
together in the time interval.
Default is no averaging.

Key: inc
Plot every INCth point (on each sub-plot) that would normally 
have been selected.   Useful if you don't want to average, but 
want to cut down on the number of plotted points.  Beware of 
increments that divide exactly into the number of triples in
time ordered data.  
Default is 1.

Key: options
Task enrichment options. Minimum match is effective. 
 nocal   Don't apply the gain corrections
 nopol   Don't apply the polarization leakage corrections
 nopass  Don't apply the bandpass corrections

 notrip  Plot all triples on the same plot, otherwise each
         triple is plotted on a separate sub-plot.

 avall   If you are averaging in time, then average all triples
         selected on each sub-plot together.  E.g. all selected
         polarizations, and, if OPTIONS=NOTRIP, all triples
         as well.
 unwrap  When plotting phase, try to unwrap it so that
         say, if one point is 179 deg and the next -179,
         they will be plotted as 179 and 181 deg.  NOTE:
         Unwrapping noise can be VERY misleading.

 all     Use flagged and unflagged visibilties
 flagged Use only flagged visibilities
         The default is to use only unflagged (good) visibilities
         ALL overrides  FLAGGED

 xind    If the x-axis is self-scaled, then unless OPTIONS=NOTRIP,
         setting XIND will cause each sub-plot to have the x-axis 
         self-scaled independently.  The default is that the x-range
         used is that which encompasses the ranges from all sub-plots.
 yind    The equivalent for the y-axis

 symbols Each file is plotted with a different plot symbol
 colours Each file is plotted with a different colour. Only works
         if plotting one polarization.
 dots    If time averaging is invoked, plot the data with dots
         rather than filled in circles.  These plot much faster
         on hardcopy devices.

 log     Write the numbers that are plotted into the log file.
         No attempt to separate baselines is made, except that
         automatically obtained by not setting OPTIONS=NOTRIP

Key: device
PGPLOT plot device/type. No default.

Key: nxy
Number of plots in the x and y directions for when plotting
each baseline separately. Defaults try to choose something
sensible.

Key: size
PGPLOT character sizes, in units of the default size (i.e., 1)
First value is for the labels, the second is for the symbol size
Defaults are 1.7,1.7  and the second value defaults to the first.

Key: log
The output logfile name. The default is the terminal.

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