The ROC and ITM substrate defocus estimator seems to be working correctly. The following two plots show the last 17 hours of (a) the XARM transmission and (b) the ROC of the four test masses as well as the single pass thermal lenses in the substrates of the two ITMs.

The estimator was engaged about 17 hours ago - which is when it first saw a signal from the ETM RHs and the ITMX CO2 laser. Hence, these ETM ROC is decreasing over time as the RH effect engages (also showing the classic RH overshoot after approximately 3 hours). Also the ITMX substrate lens starts from a static lens of around -1.2E-5 diopters and increases over around 4 hours to settle at it's nominal value.

Additionally, the IFO was being locked and unlocked. The six estimators show this transient behaviour as (a) ROC increasing during a lock and (b) ITM substrate defocus increasing during lock.