Absolute difference between 〈V_R〉 and , scaled by the mean of epoch RV uncertainties, for various subsets of the FPR sample. In the top panel, the orange curve corresponds to sources flagged for high consistency between RV and photometric periods, whereas all other sources are represented by the purple curve. In the bottom panel, the red, green and blue curve correspond to sources tentatively identified as pulsating LPVs, LPVs showing LSP variability, or ellipsoidal variables, respectively (see Sect. 3). The gray curves in both panels represent the whole FPR sample.