Basic Information on gapply

Task: gapply
Purpose: Apply gains of one dataset to another
Categories: calibration

GAPPLY is a MIRIAD task that applies gains of one visibility
dataset to those of another.

Gains can be either antenna based or baseline based.

Key: vis
Name of the input uv dataset(s). Although multiple files
are allowed, use only related data that are meant for INVERT
to be mapped. 
No default.

Key: gvis
Name of the gains visibility dataset. See OPTIONS= below
if you want to use this dataset for phase or amplitude
corrections, or both (which is the default).
No default.

Key: select
Standard uvdata selection. 
Default is all data.

Key: line
Standard line selection.
Default is all available channels, wide and narrow.

Key: options
Enable various processing options, can be combined:
  debug       lot of extraneous output
  phase       only apply phase, use unity amplitude
  amp         only apply amplitude, use zero phase
  extra       also use extrapolation for matching gain values
  jyperk      add baseline based jyperk (useful for INVERT)
  single      single side band usage: LSB applied to all channels
By default interpolation of phase and amplitude is
done, and no output of jyperk. jyperk only useful for BIMA

Key: out
The name of the output uv dataset. All data from the
input files will be calibrated, and appended to this
dataset. 
No default.

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