Background
Many times when running the pipeline there will be an spw with unphysically high delays on one or more antennas, to the tune of nearly 250ns. We have been flagging the affected data, even if it was the only flagging wanted/needed. We then investigated whether such flagging was really necessary or even perhaps was a bad idea. Although the number of examples are small, it appears that in 8/12 cases, the flagging actually leads to a slightly worse rms in the final image. Even in the remaining cases where the flagging helped the image rms, the improvement is << 1% so is not worth our time to flag.
Action items
- Toni Norton to populate this page with a description of her analysis and results