Panel (a): Relationship between O_R and the number of brightening points per unit area within the primary CH N_CB during HSS periods. The horizontal error bars indicate the ratio of the standard deviation to the mean. Panel (b): Same as (a), but with O_R replaced by the corrected occurrence rate O_R^*, where O_R^* = O_R ⋅ f(550)/f(V_HSS), f is the fitting function from Fig. 2(b), and V_HSS is the average solar wind speed during the HSS interval.