CMD of the optical HST WFPC2 and WFI samples. The adopted BSS and HB selection boxes are shown, and all the BSSs identified in these samples are marked with the open circles. The two BSSs not included in the box in the left‐hand panel lie well within the selection box in the UV plane and are therefore considered as fiducial BSSs. The open triangle in the right‐hand panel corresponds to the BSS identified beyond the cluster tidal radius, at ﹩r\simeq 24^{\prime }﹩.