Azimuthal velocity component V_φ as a function of the Galactocentric radius R_GC. Colors as in Fig. 2. For each GMM data family, a central tendency curve is constructed by separating the dataset into a number of equally populated bins in R_GC. Median values inside each bin determine the position of the dots in the curves. Only stars with 5 <R_GC< 10 kpc are considered to avoid undersampled bins in the extremes of the distribution. Error bands are computed at the 1σ and 2σ level by Monte Carlo resamplings to take into account the effect of errors in metallicity and abundances on the sample classification.