PM distribution of bulge and disk stars selected as shown in Fig. 7. Left panels: μ_lcos(b) distributions. The disk distribution is well fitted with a single Gaussian (black solid line) if the positive tail is excluded. The otherwise better skewed Gaussian fit is shown with a dashed magenta line. The bulge distribution is fitted with two Gaussians, with the centroid of the leftmost one fixed to the value found for the disk. Right panels: μ_b distributions of bulge and disk are symmetric, allowing a clean fit with one Gaussian. In all panels, centroid and dispersion of the fitted profiles are quoted.