CDFs for nine galaxies in the R_g–[Fe/H] parameter space, plotted from clustering results obtained via the DBSCAN algorithm. Contours are plotted similarly to those in Figure 3. The white contours mark boundaries that encompass 95 and 99% of the data, highlighting regions with very low probabilities of finding GCs, corresponding to approximate CDF values of 0.01 and 0.002. The hatched area highlights the depleted region of metal-poor GCs.