(Robert, Stefan)

I calibrated the REFLAIR_A_RF9 diode:
 - gain: 82Hz/(2*1000cts)  (see Alexa's elog from last week, but the amount of light we get changed slightly)
 - Cavity pole compensation zero at 82Hz.

With the PSL in science mode, here is the noise performance we get. We get a significant improvement between 2Hz and 60Hz due to the lower PSL noise. Also the noise at 0.44Hz is slightly lower on the PDH signal (not surprising - it's caused by alignment fluctuations).

The traces are:
 - Red:   REFLAIR_A_RF9 in low bandwidth configuration (on center fringe)
 - Blue:  ASC-y_TR_A_NSUM_OUT in low bandwidth configuration (on half fringe)
 - Green: REFLAIR_A_RF9 in high bandwidth configuration (on center fringe)
 - Gold:  Best curve before PSL work (July 8)

- The total RMS of the red trace is 3.5Hz, 3Hz above 0.5Hz.