Distribution of ﹩\mathrm{log}{R}_{{\rm{HK}}}^{{\prime} }﹩ versus P_rot (upper left), ﹩\mathrm{log}{R}_{{\rm{HK}},L}^{+}﹩ versus P_rot (upper right), ﹩\mathrm{log}{R}_{{\rm{HK}}}^{{\prime} }﹩ versus Ro (bottom left), and ﹩\mathrm{log}{R}_{{\rm{HK}},L}^{+}﹩ versus Ro (bottom right) for stars observed more than twice. The red dotted line indicates the position of P_rot,sat and the red solid line is the fitted segmented function line. The light red interval represents the error interval of the fitting curve.