Histograms of range(G)/A_proxy,G ratio for the samples of various variability types shown in Fig. 1. The variability type corresponding to each histogram is written in the top left of the panel in the same colour as the histogram, in decreasing order of the histogram maximum. Pulsating stars are shown in continuous thick lines, while non pulsators, that is MS rotation modulation variables (Rot. Mod.) and short time-scale variables, are shown in dashed thin lines. A dashed vertical line is plotted at range(G)/A_proxy, G = 3.3.