= More evidence for the sloshing between the real world and the abyss =

The attached plot shows the time series of POP_PDA1_DC and the P-pol build-up monitor.
This time, the P-pol monitor is inter-calibrated to "0.1 times the output of POP_PDA1_DC".
If there is no cavity for P-pol, these two traces should coincide, or at least keep a certain ratio.

Here is the result. This shows that the ratio of the power of S-pol light and P-pol light in the PRC varied in time, which is the sloshing of the coupled cavities.