I again diagonalized the PR2 with free-swinging condition. L and Y seems to be diagonalized well, however, L and P could not diagonalized. I also checked

• I turned all damping filters off.
• Take a ratio of the tilt oplev signal to the length oplev signal at the resonant frequency as follows:
  L: 0.453, P: 0.85, Y:1.0
• Pitch cannot be diagonalized, since the coupling between the length oplev and the tilt oplev changes every measurement by factor of 2-3.
• PRM diagonalization matrix introduce the noise above 1 Hz. I'm not sure what happen from yesterday, but I turned off it.