I have started to study ETMX performance:

- The figure in page 1 shows the ISI motion in the controls configuration that has been used for a week and half or so (Level 2 controls with TCrappy blend filters). Looks like the X signal has been significantly dominated by tilt (see good match of pink and green curves).

- page 2 shows the optical lever pitch motion, it illustrates that most of the RMS is in the .6 to .4 Hz band (nothing new there)

- in this controls configuration, there was a lot coherence between ISI RY signal and the optical lever motion (page 3)

- So I switched Stage 2 to a less aggressive blend configuration. It did not cost any optical lever performance (page 4), but changed the coherence (page 5). The optical lever motion is now coherent with ISI longitudinal motion, which is, I think, much easier to analyze and improve. It allows to implement sensor correction from stage 1 to stage 2.

- I implemented sensor correction from stage 1 to stage 2. It had a good effect on the optical lever motion (page 6). I have started to do some gain and phase margin, but there's room for further improvement.
 
The wind is currently pretty low, so we'll have to wait to find out whether this configuration is more robust against changes of input motions (see past logs on high winds)