For reference

I attached the residual motion in both amplitude spectrum and time series of the BS while it's in the "ALIGNED" state with IP inertial damping on. I measrured it with normal IP LVDT damping as wel, they are quite similar. The yaw motion at 0.16 Hz as reported in 9235 is not observable anymore for some reason so the high gain inertial damping might not be needed as it doesn't work well to damp the motion caused by the IP DC control.

The measured rms displacement for all degrees of freedom are all around 0.1 - 0.2 µm/µrad while the peak-to-peak amplitude as seen in the 10 minute time series is ~1.8 µm, ~0.8 µrad and ~0.8 µrad for Longitudinal, pitch and yaw respectively.