Additional monitoring variables

In addition to the plethora of uv variables that can be examined by an observer, the following are particularly relevant for 3-mm data.

smonrms	ATCA seeing monitor rms (in microns)
refpnt	Reference pointing solution (in arcseconds).
axisrms	RMS tracking accuracy
axismax	Maximum tracking accuracy

These variables can be plotted or listed with varplt, e.g.

VARPLT
in=vela.uv	Input visibility dataset.
device=/xs	PGPLOT plotting device.
yaxis=axisrms	Plot rms tracking error.