Combined color-magnitude diagram of 75 GCs. Cluster members and RRLs meet the quality cuts described in Appendix B. Real RRLs in clusters are located in the HB, around (BP − RP)₀ ~ 0.5 mag and mag. Stars located outside the HB, are unlikely cluster members or not real RRLs. The G23 stars on the main sequence have the expected color for RRLs, but not the expected intrinsic absolute magnitude.