Histograms for the three different regions and the peakless sample as a function of different stellar parameters. In blue: Sample of stars with rotation peaks. The different shades of blue correspond to the three regions of Fig. 6 cut according to the Rossby number. This slicing is illustrated in panel (a) as a function of the Rossby number. The orange histograms represent the peakless group. From top to bottom, the histograms are for (a) the Rossby Number, (b) spot impact proxy, (c) the mean lifetime τ_life,(d) the rotation period, and finally (e) the ratio P_rot/τ_life.