Model subtraction from uv data (uvsub)

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4.7.4 Model subtraction from uv data (uvsub)

The uvsub task will subtract the Fourier transform of the associated model of the MS (added to the MS with the tasks ft or setjy) from that in the CORRECTED_DATA column in the input MS and store the result in that same CORRECTED_DATA column.

The reverse operation is achieved by specifying reverse = True: in that case uvsub will add the value of the Fourier transform of the associated model to that in the CORRECTED_DATA column in the input MS and store the result in that same CORRECTED_DATA column.

The inputs are:

#  uvsub :: Subtract/add model from/to the corrected visibility data.

vis          =         ’’   #  Name of input visibility file (MS)
reverse      =      False   #  reverse the operation (add rather than subtract)
async        =      False

For example:

uvsub(’ngc5921.split.ms’)

ALERT: Currently, uvsub operates on the CORRECTED_DATA column in the MS vis. Eventually we will provide the option to write out a new MS.

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