[Aritomi, Yuhang, Eleonora]

First we changed the demodulation phase for WFS1 from 17.5 deg to 107.5 deg in order to have all signals in I phase.

Then we measured spectrum of WFS signals (attached picture). As you can see, 11Hz BS pitch peak appears in WFS1_I_YAW which means there is large pitch and yaw coupling in WFS1. Eleonora will make rotation matrix to rotate WFS1 I pitch and yaw.