I looked to see if LHO would benefit from doing better L2A decoupling on some of the corner station suspensions, similar to Arnaud & Marie's work at LLO (LLO alog 31459, for instance). The attached PDF shows the coherences between the different PD PIT & YAW INMONs used for ASC and the M1_DRIVEALIGN_L_OUTMONs for PRM, MC2, BS and SRM, during a windy time a couple of weeks ago. I'm a little confused because PRM and MC2 seem to have a lot of coherence with a lot of PDs, but maybe folks who know the ASC system better can make sense of this. SRM shows somewhat less coherence, but more than the BS. Each page is a different PD, the top plot is coherence between each suspensions length drive and the spot pitch. The bottom plot on each page is the yaw coherence. I believe the color scheme is the same for all plots.