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Compute and add some missing information in a UV Table, such as the Doppler correction and the Parallactic Angle
The information is derived from the Observatory coordinates, from the Telescope name in the input UV table. This can be supplied by the SPECIFY TELESCOPE command if not available.
ITEM can take values DOPPLER, PARALLACTIC or * for both.
Mode is a debug control integer which indicates in which column the information should be placed. The default is 0, i.e. the command will re-use the column of the appropriate type, or add it if not present. It may be set to 3, as often column 3 contains the Scan number, which is not a relevant information for imaging. Other values are at the user's peril...