Metallicities of full sample of bulge clusters. Left panel: histogram of metallicity including the 42 well-known bulge clusters from Bica et al. (2016) and the new sample clusters, excluding clusters classified as belonging to the halo and disk, those that have [Fe/H] < −1.5 dex, and clusters that have distances out of the range of 4 < d_⊙ < 11 kpc. A histogram combining both samples is also shown in green. Right panel: Kernel density estimation, showing the distribution peaks independently of the bin size: Bica et al. (2016) with peaks in −1.05 and −0.40 dex, the new cluster sample with peaks in −1.20 and −0.55 dex, and the combined sample with a higher peak consistent with Bica et al. (2016) but with a smaller peak shifted to a more metal-poor value (dashed lines: −1.08 ± 0.35 and −0.51 ± 0.25 dex).