P. Marsh

Jenne had asked to see if Delta L Ext noise in the 30-80 Hz band dropped while ETM and ITM beam spot positions were being moved this month; the short answer is no. 

In the attached document, the 1-100 Hz range is shown for various times during the spot moves, as compared against a reference spectrum on June 30th. The only obvious change is that some 20 Hz lines drop out between spot moves around 3:15 UTC and 3:45 UTC on June 15th but Jenne suggests that these were injected lines being shut off manually.