Spatial distribution of stars in the sample we are analysing in x–y (top panel) and R–z (bottom panel) planes. Total number of stars in the sample is provided in lower left-hand corner of top panel. In both maps, number of stars, in logarithmic scale, per pixel, the pixel size being 50 × 50 pc², is colour-coded as given in the bar on the right-hand side of each panel. The Sun lies at x = −8.34 kpc, y = 0 and z = 27 pc.