Metallicity maps of the simulated galaxy in Galactic coordinates. Top panel: disk and classical bulge stars are included; bottom panel: disk stars are only shown (see text for the choice of the initial metallicity of disk and classical bulge stars). In both panels, only stars with | x | ≤ 2.5 kpc and | y | ≤ 3 kpc from the galaxy center have been selected. Some contour levels for the metallicity maps are also reported with values given in the maps.