Today, taking advantage of a stable lock and with the agreement of the commissioning crew, we injected broadband magnetic noise (10 to 200 Hz) into the CEB from 10:54:00 UTC to 11:43:00 UTC (the interferometer unlocked a few seconds later for unknown reasons).

It is interesting to note high coherence with Hrec_hoft (and somewhat less with LSC_DARM) in the whole range of the noise injection.

here a log x plot, and here a linear x plot  (in both Purple is when injection was OFF).