[evlatests] Curious correlator problem

[Rick Perley]

In my most recent 'lunacy' observation (taken 13 December, at P-band), I 
have found that a number of correlations, in spectral window 5 only, are 
not present in the data.  Presumably were 'pure zero' correlations, and 
removed in the download.

For the following baselines, all four correlations are absent, for the 
entire observation -- but only in SPW05.  All other spectral windows are 
complete.

ea04 x ea 08 through 21.

ea 17 x ea17, 10, and 22

ea 21 x ea06 and 11

ea27 x ea05, 13 and 19

ea23 x ea26.

Is there an explanation?

Rick