[evlatests] Zeros in Friday data

[Michael Rupen]

We now believe that these zeroes are associated with particular Baseline
Boards and are working to understand what exactly is wrong with those
BlBs, and why the problem manifests in this way.  I plan to avoid
the problematic boards in scientific observations, so hopefully we won't
see this in actual RSRO data.

           Michael

>    I noted in my earlier report that something like 7% of the data were
> noted as integer zeros, but I had not identified their origin.  A few
> minutes extra poking around revealed where they are -- it is I think
> much the same situated reported by Vivek.
>
>    The zero pattern is quite regular, and quite odd:
>
> Subband 1 (spectral window 0) is the only one with extra zeros.
> Within this window, for the entire length of the run:
>        Antennas 3 and 4 (all polarization products) are zeroed with all
> other antennas except 1.
>       Antennas 9 and 11 are zeroed with all others except antennas 1,
> 2, and 7
>       Antennas 14 and 15 are zeroed with all others except antennas 1 2
> 7 8 and 12
>       Antennas 18 and 19 are zeroed with all others except antennas 1 2
> 7 8 12 13 and 16.
>
>
>
>
>
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