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The TIP tool takes the raw output from the VLA on-line system
and does a full fit to determine opacity and To (all contributions
to Tsys which are constant with elevation), and optionally, the
values of Tcal (the "noise tubes" or calibration loads for the
VLA). The opacity is assumed to be constant over all antennas of
the array. The values of To and Tcal can vary from antenna to
antenna and on the 4 IFs for each antenna. The mathematics are
described in
Scientific Memo 170 (ps),
and some related
information is contained in
Test
Memo 232 (pdf).
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