Metallicity distributions. Right and in the middle panels we show the KDEs and histograms for the known MW GCs for the Mészáros et al. (2020) (orange lines), Harris (1996) (2010 edition – blue lines), bulge GCs (Table 2 – magenta lines), and our work (green lines) samples, respectively. In the right panel, we also show the densograms in order to better discriminate the higher peaks (yellower colors) of the distributions. On the left panel, we show histograms for different samples of bulge FSs, as specified by the legend. The grey areas, in the middle and left panels, are used to point out that at metallicity [Fe/H] > 0 we do not have any GCs, while a higher percentage of bulge FSs is located at that range.