Motivated by interested results from Sheila's ESD tests last week (LHO:73913) and Gabriele finding that there is some nonlinear noise coupling in ETMX L3 from <4Hz to 15-25Hz in DARM (LHO:73937), I've started taking a closer look at the DARM loop to 1.) reduce ETMX L3 actuation below 4Hz (nominally by increasing L1/L2 actuation at low frequencies) and 2.) to have the UIM stage roll off more aggressively, similar to what LLO has had in place since O1 (see for example page 10 of G1501372 and page 11 of G2000149 ). 

I'm uploading the "DARM critique" generated by pyDARM for H1 based on report 20231027T203619Z. This is still a work in progress; I'm just leaving these plots & links here for my own future reference.