Power spectra and coherance plots attached, one from 04:04UTC, and the other 04:40UTC, both from today.  ETMX has peak at 9.8Hz, but also a second peak at ~9.94Hz, in the power spectra, and in the coherance with Cal Delta, there's a lot going on between 9Hz and 11Hz, with what apears to be 4 major peaks, all with coherance of 0.7+.  In contrast, all other quad optics have one coherance peak around 9.8Hz, and no others that are above 0.1 in coherance between 9Hz and 11Hz.