Distribution in for the nine clusters, showing the large difference among the GCs. The stars are colored in blue or red (and green, only for NGC 6752) according to the separation made in δ₄ (see previous figure); this division is only indicative. The colored histograms refer to the blue/red populations. The black, heavy lines represent the cumulative functions (to which the left y-axes refer) of all stars below the RGB bump, indicated by an arrow.