J. Kissel, H. Radkins

We'll fill out with more plots, data, and information later, but we've found that the newly installed differential pressure readout in the corner station HEPI pumps is coherent with noise in the BSC HPI L4Cs between 0.1 and 1 [Hz] in Z, and 0.01 - 0.1 [Hz] in RZ. I attach results for the Beam Splitter's tank.

**Edit -- Page Three had terribly confusing labels, I've now fixed the plot to reflect the information correctly -- its the rotational DOFs, which are, of course, in [rad/rtHz].