This task checks whether the WVR radiometers are working as intended, interpolating for antennas that are not. Scoring assessment investigates the phase RMS improvement ratio and number of flagged antennas, checks if the phase and bandpass source phase RMS values are elevated or noisy, and finally whether the solutions from running the CASA wvrgcal task have elevated rms path or discrepancy values (>500μm). Poor scores and very high rms path and discrepancy values may point to cloud conditions during the observations. The WVR caltable is only added to subsequent pre-applys if it gives a tangible improvement.
This measurement set either does not contain any antennas with WVR data, or in the case of mixed-array does not contain enough antennas with WVR data (as set by the threshold parameter in inputs). WVR calibration and flagging has been skipped.