Rahul asked me to take some reference transfer functions on ZM4 before they go in and swap out the PSAM. I've done that, and these reference traces can be found in /ligo/svncommon/SusSVN/sus/trunk/HXDS/H1/ZM4/SAGM1/Data/2026-07-07_2030_H1SUSZM4_M1_WhiteNoise_{L,P,Y}_0p02to50Hz.xml at r13056. The red traces are the newest measurements while the blue measurements are from when we did our last closeout checks in February 2026. ZM4 was IN HEALTH_CHECK during this measurement.