Arnaud and I noticed last week that some of the ISIs were moving differently in their beam axis directions in the corner. Looking more closely this week it looks like the ITMY STS has some extra noise on its Y-axis. Fortunately, Hugh had moved the HAM5 seismometer near the biergarten long ago, looking for a lower tilt location, so I have switched all the corner station chambers to use this instrument instead.

Attached plot shows asds for the ITMY and HAM5 STS, they should agree up to several hz, but the ITMY sensor shows extra noise around 1 hz in Y. The bottom plot shows the coherence between the two sensors, X coherence is very good, but the Y coherence is not so good. I've also looked at the coherence to the ITM HEPI L4Cs, and the story that the HAM5 sensor is better hangs together.

Somebody said something about T360s? Can I have one please?