Density maps for different slices of Pristine-Gala synthetic metallicities, projected in Galactic coordinates. The contours correspond to E(B − V) = 0.5 and E(B − V) = 0.15. From top-left to bottom-right, the four top panels display density for metallicity ranges [Fe/H]_CaHKsyn > −1.0 (panel I), −1.5 < [Fe/H]_caHKsyn < −1.0 (panel II), −2.5 < [Fe/H]_caHKsyn < −1.5 (panel III), and −4.0 < [Fe/H]_CaHKsyn < −2.5 (panel IV). To overcome the inhomogeneous survey and highlight the transition in the shape of the MW, the bottom four panel shows ratios of density maps. From top-left to bottom-right, II/I, III/II, IV/II, and IV/III.