Mean number of stars (A), Galactocentric radii (B), distances from the Galactic plane (C), azimuthal velocities (D), azimuthal velocity dispersions (E) as measured from the data (in black) and corrected by the error measurements (in green), at different metallicity bins, for stars located within the greater solar neighbourhood. Panel F shows the correlations between the mean azimuthal velocity and the α −abundance ratios for different metallicity bins. The error bars represent the 3σ Poisson noise averaged over the Monte-Carlo realisations. The bins are 0.07 dex wide, chosen as a compromise between the number of stars inside each bin and an adequate coverage of the metallicity range.