Comparison between the semi-amplitudes A_G, of the best-fit models of the G-band and RV time series for the TQS (light gray symbols in the background). The darker symbols indicate sources whose RV period is consistent with the photometric periods in a 1:1 ratio (top panel) or in a 2:1 ratio (bottom panel). The dashed red line corresponds to Eq. (9), and the size of each sample is indicated in the legend.