Radial distribution of the BSSs and HB double normalized ratios, as defined in equation (1), plotted as a function of the radial coordinate expressed in units of the core radius. R_HB (with the size of the rectangles corresponding to the error bars computed as described in Sabbi et al. 2004) is almost constant around unity over the entire cluster extension, as expected for any normal, nonsegregated cluster population. Instead, the radial trend of R_BSS (dots with error bars) is completely different: highly peaked in the center (a factor of ~3 higher than R_HB), decreasing at intermediate radii, and rising again outward.