Setting up the calibrater tool

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Setting up the calibrater tool

A Calibrater tool is initialized by specifying an input MS. This is used throughout subsequent calibration. If another MS is to be calibrated at present, a second tool will be required. Note, however, that the facility to append to existing calibration tables allows individual measurement sets to be processed in sequence and does not require the the input data be concatenated.

To construct a Calibrater tool (for a spectral line polarimetry dataset called polspec.ms):

include 'calibrater.g'               
cal := calibrater('polspec.ms')      # Construct tool

If the dataset has not previously been used in a calibrater or imager tool, this step will form the CORRECTED_DATA, MODEL_DATA, and IMAGING_WEIGHT columns. The CORRECTED_DATA column will be initialized as a duplicate of the (observed) DATA column. The MODEL_DATA column will be initialized with unit total intensity point source visibilities. The IMAGING_WEIGHT column will be initialized with unit weights, and is described in more detail in imager tool documentation.

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