Fig. 3
Example of diagnostic plots during the calibration process (taken from Bihr 2016). The imaginary part of the visibility is plotted as a function of the real part for the calibrator 3C 286 in the HI line. The color-coding corresponds to the different antennas. For a point source like the calibrators a roundish cloud as shown in the top panel is expected. The deviations in the bottom panel isolate bad antennas that need to be flagged.
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