The Y-axis selection. The same list of variables is
also available for the X- and Z-axes. Here is a short description
of some of non-selfexplanatory items.
ScanNo: Sequence number of scan in total data set.
VisSq, c, e, c/e: The squared visibility amplitude, uncalibrated,
uncalibrated but corrected for non-zero diameter, calibrated
and corrected for diameter, respectively.
TripleAmp, c, e, c/e: Amplitude of triple product, with same attributes
as VisSq.
TriplePhase, c: Uncalibrated and calibrated phase of the triple
product (also called closure phase).