Distribution of Galactic azimuthal velocities V_ϕ for samples A and C. Upper panel: Probability distribution function of V_ϕ for sample A and original sample C of this study, normalised to set the area equal to 1. The dark red bars show the stars distribution of sample C, while blue bars show sample A, displayed with median values (P₅₀) and median absolute deviations (MAD) in km/s. Vertical dashed lines denote the median values for each sample. Bottom panel: Same as the upper panel considering sample A and subsets of sample C. The red and orange bars show the stars distribution of sample C for sources below 3 Gyr and over 10 Gyr, respectively, to avoid contribution from stars in each subset.