Observed RV dispersions as a function of Galactic latitude b along the bulge minor axis, compared to the models of Fux (1999), cf. Fig. 8 of Babusiaux et al. (2010). The blue symbols are the data points from Babusiaux et al. (2010), the black symbols are from this work. The diamond symbol represents the velocity dispersion of the complete sample, while the open downward-pointing triangle represents the 33.3% metal-poor quantile and the filled upward-pointing triangle represents the 33.3% metal-rich quantile, respectively.