RRLs (pink open circles) in clusters detected in this study and cluster members (white dots) in the HB detected by VB21 with membership probabilities above 50%. The squares indicate the bins in color and absolute magnitude used to estimate the fraction of RRLs over the number of cluster members detected by VB21. Each bin was color coded according to its specific RRL fraction, the color bar is located at the top of the plot. The purple contours indicate the 68th and 84th percentiles of density of RRLs.