Panel a: distribution of the ratios of the interquartile range (IQR) in the G_BP versus G_RP bands vs. the median G-band magnitude for the RR Lyrae candidates in the SOS (green dots; Clementini et al. 2019) vs. those present only in the classification results (red dots). Panel b: distribution of the number of G-band FoV transits for each source for the RR Lyrae candidates in the SOS (green bars) vs. those present only in the classification results (red bars).