Earlier today I took data for redoing the MICH and SRCL feedforward filters, following my instructions from alog 47185.

* Measured MICH FF with both mich and srcl ff off

* Turned on mich ff (feb 28 filter), then measured Srcl ff.

I apparently don't actually understand the nuances of the fitting scripts as well as I thought, so I haven't actually created new filters.  I checked the current coherences of MICH and SRCL with DARM, and they are both quite low (1e-2 level), so they're already fine for now anyway. 

Note that the PRCL coherence is still around 5e-2, so we will want to address this. Hopefully it'll be fixed by the TCS tuning to minimize frequency noise coupling, but if that doesn't work, we may need to consider using the PRCL FF filters.