Comparison of two approaches to determine the velocity dispersion. In all panels, the y-axes show the and the x-axes the σ_eff values colored by the regions defined within this work (see the mask in Figure 5). Only the upper left panel shows the x and y axes in linear scale, all the others are in log scale. We show linear regression fits between and σ_eff for the central disk (yellow), ring (orange), southern area (red), southern arm (purple), and northern arm (black). We see the highest scatter in in the ring region of ∼2.5dex. This is likely to represent a multi-component spectrum.