[Stefan, Eleonora, Masayuki, Yutaro]

1. PRCL PDH signal with HOMs
Conditions:
- REFL_45I
- Relative power of each HOM: 0.3

First plot: Gouy phase in PRC = 33.0 deg (nominal)
Second plot: Gouy phase in PRC = 14.0 deg

2. PRC Gouy phase vs {PR2-PR3 distance | PR2 RoC error | PR3 RoC error}
Plots are attached.
Tiny errors in any of them would give us ~15 deg of Gouy phase.