Orbital period vs. the rotation period for the 17 systems (out of the set 35 RG/EBs studied by Gaulme et al. 2014 and this paper), where significant surface activity is detected. The size of each symbol represents the amplitude of stellar variability and the gray scale indicates the pulsation-mode amplitude (white–no modes; black–large amp). The parallel lines indicate isolevels of the ratio P_rot/P_orb. This figure is an updated version of Fig. 5 from Gaulme et al. (2014).