I believe that the 17 Hz broad structure on SIDE is just because of a bad rotational angle of the SIDE OSEM.
The same structure had been observed on the EMTY_UR, and the structure became narrower after we repositioned/rotated the OSEM yesterday.
My guess is that the SIDE OSEM is now in a place where the OSEM is quite sensitive to the bounce mode
and creating the broad structure due to a bi-linear coupling between the bounce mode and low frequency signals.
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There is something defintely wrong with the side sensor. It might be the electronics as it also has this problem with it slow channel readings (my previous elog today).
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