Cao, Dan

There were still some lines left over that have coherence with H1:PEM-CS_ACC_ISCT1_REFL_Y between 100-1000Hz. We looked at whether these lines were from the phase camera path still or something else in the POP AIR path. We dumped everything  by block just after the uniblitz shutter and could still see the lines. We then closed the POP beam diverter and we could still see the lines. So it doesn't look like POP AIR or the phase camera are causing these lines.