Relative RVs of a sequence of Fabry-Pérot exposures in the science channels (A and B in blue and orange, respectively) as a function of time relative to the first exposure and corrected for the simultaneous calibration channel (C) RVs. The green curve shows the combined science-reference relative RV drift, shifted by 0.5 m s⁻¹ for clarity. The vertical pink lines separate different polarimetric sequences.