Jennie W, Sheila.

I chose a high range time from a lock during O4a, specifically 2024/01/15 21:41:15 UTC, and compared the OPLEV values with todays.

See attached image.

OpLEVs which are the same as in observing: SR3 PITCH/YAW, PR3 YAW, ETMX PITCH/YAW.

OpLEVS which have changed:

ETMY PITCH by +24 cts.

ETMY YAW by -1.8 cts.

ITMY does not count as it is mis-aligned for OMC single bounce measurements.

ITMX YAW by -10 cts.

ITMX PITCH by -5 cts

BS PITCH by +14 cts.

BS YAW by - 10 cts.

PR3 PITCH by 0.2 cts.

Used Sheila's OPLEV template from /ligo/home/sheila.dwyer/ndscope/SUS/sus_op_levs.yml.