Distribution of the log dominant variability amplitude plotted against the dominant variability period of the O − C variation, derived from wavelet analysis shown in the upper panel. The colour scheme is as follows: LMC F (red), LMC 1O (green), SMC F (purple), and SMC 1O (gray). The lower panel presents the log dominant variability amplitude as a function of the log pulsation period, with linear fits. The scatter points and fits follow the same colour scheme as in the upper panel.