Difference between the best-fit and the observed velocity dispersion in terms of the observed error, for all 9 × 9 kinematic bins. The figure is obtained after fitting the q94v21 library to our mock data consisting of 10⁵ stars with measured line-of-sight velocities in our FOV, assuming an edge-on view. Top and right panels: fit (red full line) obtained along the major and minor axis, respectively. The data points with 68% error bars are shown in black. Black dashed lines indicate the true velocity dispersions from theory (Eq. (4)).