O, Mg, Si, and Ca abundance as a function of [Fe/H]. The KDE plot represents the RPM bulge selection from cell F, and the blue contours represent the RR Lyrae sample. The stars are abundances of bulge GCs: NGC 6558 (cyan), NGC 6522 (pink), HP1 (green), and Pal 6 (magenta). The golden star represents the mean abundance of NGC 6355. The chemodynamical evolution models are shown in different radii ranges: r < 0.5 kpc (dash-dotted line), 0.5 < r < 1 kpc (dashed line), 1 < r < 2 kpc (dotted line), and 2 < r < 3 kpc (solid line).