[Sheila, Jenne]

The CHARD error signal blending is back in the guardian.  Note that I engaged it by hand while at NomLowNoise, but it's in the guardian to come on during EngageReflPopWfs.  So, it has not yet been tried during the acquisition sequence. 

Next time, it should just come on correctly with the guardian.  But, in case we need to come back to turning it on later, I used the same procedure for pit and yaw:  Engage the blend filters on the B filter banks, ramp up the gain to 1 over 10 sec.  Once it's started ramping, turn on the matching blend filter in the A filter bank, which ramps on over 10 sec.

In the attached screenshot the solid traces are before blending, and the dashed traces are after blending.  You can see that as expected, the blending significantly reduces the CHARD noise in DARM, and the coherence between CHARD out and DARM decreases dramatically.   There's still a bit of coherence left around 15 Hz with CHARD_Y, but it's much better than it was.

I leave the IFO undisturbed with the Observe bit set starting at 03:10:00UTC.