Amplitude (from the 10th to the 90th percentile), in magnitudes, of the periodic LCs, against P (left) and ﹩(V-{K}_{{\rm{s}}})﹩ (right). The vertical lines are for the divisions from Figure 7—solid lines are for Praesepe and dotted lines are for the Pleiades. Black points are those stars with single periods, and orange dots highlight those with multiple periods. An additional green circle highlights the likely pulsators. Blue lines in the second panel are lines just to guide the eye in the text discussion. Longer periods have smaller amplitudes.