[Komori, Michimura]
Simple noise subtraction of K1;LSC-REFL_PDA3_RF45_I_ERR using bandpass filters gave us +0.066 Mpc mainly from 116 Hz peak.
Clever filter design should give us further!
What a coherence. Facing on the sensitivity being better now than ever, it might be nice to re-measure some transfer functions from IMC-ASC to {DARM, this REFL45} as a first step.