Spatial distribution of stars with [M/H] > −0.25 in face-on view (X-Y, panels 1 and 3) and edge-on view (R-Z, panels 2 and 4) after the selections described in Sect. 2. The position of the Sun is indicated by a red ‘+’ sign, at R = 8.249 kpc. The plots are colour-coded by the number of stars (left two panels) or the average metallicity (right two panels). Iso-contour lines containing 33, 66, 90, and 99% of the distribution are plotted in each panel.