[daip] QUACK

[Jim Ulvestad]

Is it useful for QUACK to have an option to flag by baselines
rather than only by antennas?  See snippet below from my
EVLA test message today.

Brief data report from AJ329
=============================
AJ329 was observed Wednesday morning, for 1.5 hours,
at about 1230 to 1400 UTC.  It was the simplest sort
of observation, all X band default continuum, 50 MHz
bandwidth, with no frequency or band changes.  Default
frequencies were 8435 and 8485 MHz.  Three
EVLA antennas were used -- 13, 14, and 16.
10-second integrations were used.  The target source was
a weak source of a mJy or yes, with a 2.3 Jy point source
calibrator also observed every 10 minutes or so.

(1) All EVLA-EVLA baselines appeared to be bad for the
first 10-second records of each scan.  QUACK appears to have
an option only for flagging data by antenna and not by baseline,
so antennas 13, 14, and 16 were flagged completely for the first
record of each scan.  The values in these records typically
are low by about 20%, but not at zero.

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