Ross Kennedy and Ed Daw.

During the lock around 00:43:42 UTC tonight we took a coherence/cross spectrum measurement between REFL AIR9 and OMC DCPD1. The first figure attached shows the 
ASD in each channel. These were taken remotely using an SR785. 8 800 bin ASDs each covering a frequency span of 12.8 kHz were assembled to cover a total bandwidth of 102.4kHz with 16Hz resolution bandwidth. The second figure shows coherence per 16 Hz bin (above) and the phase of the cross spectral density (below). Note that the peak coherence is around 0.04 per Hz over a 16Hz bin, or 0.64 over the whole bin.