Basic Information on calib

Task: calib
Purpose: Display raw calibration data with user interaction
Categories: calibration

CALIB is a MIRIAD task which displays the raw calibration data and 
optionally a fit. Calib reads the data and fit from a cal file and 
displays the result visually.  The user has the option to view the
amplitudes, the phases, or the sums and difference of the phases in
the two sidebands.   The fit is displayed as a
line over the points, and all the axes are labeled, with ticks.  The
user may interactively pick different plots to zoom on, and can mark
individual points as good or bad. Breakpoints in time can be added
and deleted as well. A new polynomial fits can also be added 
interactively.

Commands in cursor mode are:

  d/D -- flag the nearest point as bad (uppercase only one band)
  a/A -- flag the nearest point as good (uppercase only one band)
  x   -- zoom/unzoom toggle on the current column
  y   -- zoom/unzoom toggle on the current row
  z   -- zoom/unzoom toggle on the current plot
  b/B -- insert breakpoint (uppercase only one band)
  c/C -- delete breakpoint (uppercase only one band)
  0-9 -- order of new fit on current row (U or L)
  ma  -- change mode to amplitudes
  mp  -- change mode to regular phases (U and L)
  md  -- change mode to phase difference and average
  q   -- quit (no save)
  e   -- exit (save flags, breakpoints and fits if modifications done)
  ?   -- this help and redraw screen

Key: gcal
The calibration data set.  
No default.

Key: source
Source names to be selected. 
Default is all sources selected.

Key: flags
Use flags for scaling? If set to false, all points are selected
for viewing, including the ones previously flagged bad.
Default: true

Key: mode
Work on 'amplitude', 'phase', or 'difs'.
Default: amplitude

Key: close
Use closure? If set to true, closure will be applied to the phases,
Also note that in closure mode breakpoints must be at the same time 
accross baselines. Default: false.
Note: *** this mode is under development ***

Key: taver
Taver consists of two numbers, TGAP and TTOT, both in minutes;
they are used for vector averaging. If the time interval between
any two successive data points is greater than TGAP, or if the total
time between the first data point in a vector average and any
succeeding data point exceeds TTOT, then a new vector average is
started. The time-(X)-axis on top of your plot should be labeled
in (UT) hours-minutes and seconds. The bottom is labelled in fractional
days, offset from the date in the plot-header.
Default: 0.0,1000.0 (no vector averaging)

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 is "?"

Key: units
Units to work in. Options are: K, K/Jy, Jy/K.
Note: since CALAPPLY assumes Jy/K any other units are nice to
look at, but produce badly calibrated files.
Default: Jy/K.

Key: ampmax
If supplied, the amplitude scale is fixed from 0 to ampmax,
otherwise autoscaling is done. Default is autoscaling.

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