The trend of velocity dispersion with longitude, in six strips of constant latitude. The horizontal dashed line at σ_RV = 100 has been drawn to guide the eye. Notice that, in the outer bulge, |b| > 3.5, the metal poor component has a higher velocity dispersion compared to the metal rich one. However, at b = −2,σ_RV is roughly equal for both metallicity bins, while at b = −1 the σ_RV for the metal poor sample lies below that of the metal rich population. Notice that the metal poor component at b = −3.5 contains very few stars, for this reason the trend is noisy (dashed line).