Flagging based on tracking errors (bugzilla 376)

The axisrms UV variable holds the tracking error (in arcsec, in Az and El) for each antenna in the array. It can be useful to automatically flag data when the tracking is above a certain error, or even antennae based (e.g. allow OVRO to have a smaller tolerance than the BIMA antennae). In older data the axisrms was not written properly, and could even be negative. It is currently written $\sqrt{2}$ times what it really should be. But check your plots!

  % varplt vis=c0048.umon.1.miriad device=/xs yaxis=axisrms options=overlay yrange=-4,4

  % uvflag vis=c0048.umon.1.miriad 'select=-pointing(0,4)' flagval=flag options=noapply 

this last example shows the number of visibilities that would be flagged if their RMS pointing was off by more than 4 arcsec.