Ken, Preeti, TJ
We've made transfer functions to see and compare the level of cross coupling between P and Y at both sites for the top stage of BBSS. The L1 traces were rescaled to match the H1 magnitude for the PtoP comparison at 0.1Hz. The scaling factor was 3.72. This was done to compensate for the DAC differences between the sites. All of the L1 traces were multiplied by this scale factor. All plots are found in the attached PDF.
TF plots corrected to have consistent axis scales
LHO data taken from /ligo/svncommon/SusSVN/sus/trunk/BBSS/H1/BS/SAGM1/Data/2026-07-06_1500_tfs. BSC2 ISI was locked and measurements are taken in air
LLO data is taken from /ligo/svncommon/SusSVN/sus/trunk/BBSS/L1/BS/SAGM1/Data/20260706_BBSS_1TOR. BSC2 ISI was fully isolated and the chamber was under vacuum at about 1 Torr.