Basic Information on attsys

Task: attsys
Purpose: Apply or un-apply on-line Tsys values.
Categories: uv analysis

ATTSYS either applies or removes the Tsys weighting from correlation
data.

NOTE: If you are using two IF bands when observing, ATTSYS cannot
be used after you have split or copied the file down to single-IF
datasets.

Key: vis
The names of the input uv data sets. No default.

Key: out
The name of the output uv data set. No default.

Key: options
Extra processing options. Several options can be given,
separated by commas. Minimum match is supported. Possible values
are:
  apply     Apply the Tsys correction to the data. This is the
            default.
  unapply   Undo the Tsys correction in the data. Note that you
            cannot use the "apply" and "unapply" options
            simultaneously.
  auto      Use the "tcorr" variable to determine whether Tsys
            has been applied or not.
            NOTE: Information needed for options=auto is lost if you
            copy or split a dataset. If you are going to use 
            options=auto, you generally have to do it on the file
            resulting from atlod.

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