As described in WP 7062, I have turned on alignment dither lines for PR3, ETMX, and ETMY.

The attached script turns on the lines and sets up the demod matrices, although I don't think it should be necessary to turn the lines off. The attached spectrum shows the new lines in DARM and PRCL at 6.7 Hz (ETMX Pit), 8.1Hz ETMX Yaw, (8.43Hz ETMX yaw), 7.4 Hz ETMX pit, 8.8 Hz ETMY yaw, 13.2 Hz PR3 PIT and 14.8 Hz PR3 Y.  These lines are on for the first time in this lock stretch (starting around 20:30 UTC Jun 28th).  I am hopping to leave them on for a few days/up to a week to get some data. 

The motivation for this is to leave these lines on for several days, to see if using a dither to replace some of QPDs would help to make our jitter coupling more stable over time.

Edit: Keita and Jeff K were concerned about the line at 8.1 Hz potentially causing a problem for calibration, so I moved it to 8.43 Hz.