We noticed that the 10-30 Hz noise is worse recently compared to our Feb 28 reference. I ran Gabriele's A2L script on ITMX (the only test mass without a dither line). It barely changed the A2L gains (Y2L went from 0.366 to 0.259, P2L from -3.926 to -3.9819), and there wasn't any change.

I also drove the OFI (transverse) at 1Hz to see if it affected our 48 Hz scatter or any other lines, it did not. Attachment shows DARM spectra and OFI error signals with and without the excitation, excitation times are shown in red, quiet times in grey.