How much was the osc freq of the marconi? And then how much was the resulting freq offset between PSL and AUX?
Are we supposed to see two dips with the separation of an FSR? Or four dips (you have two sidebands)?
And the distance between the dips (28MHz-ish?) seems too large to be the FSR (22MHz-ish).
cf https://wiki-40m.ligo.caltech.edu/IFO_Modeling/RC_lengths |