Radial velocity dispersion along the bulge’s a) major and b) minor axes compared with the disc particles of the model of Fux (1999) rotated and translated as in Fig. 13. The metal-poor population corresponds to [Fe/H] < −0.2 dex and the metal-rich population to [Fe/H] > 0 dex. Figure b) completes Fig. 8 of Babusiaux et al. (2010) with our minor axis field (l = 0°,b = 1°) assuming symmetry between positive and negative latitudes.