Radial profile of the velocity dispersion, σ_v, and the H I gas surface density Σ_HI, together with the point density of σ_v and Σ_HI for individual lines of sight (circular points; the color-coding reflects a linear density distribution, where the highest density is shown in yellow). Top panel: We compare here the effective width (σ_eff purple-to-yellow scatter points) and ( grey points) approaches to estimate the velocity dispersion across the whole disk of M 83. We show the median for (grey solid line), the median for σ_eff (pink solid line), and the results after stacking σ_eff (pink-white dashed line). We see in all three cases enhanced velocity dispersion in the central disk and in the ring (indicated by the dashed vertical lines at 8.1 kpc and 16 kpc). The horizontal dashed line indicates the 8 km s⁻¹ limit that we discuss in Sect. 4.1. Bottom panel: The profile of the H I gas surface density shows an enhancement of H I gas in the ring. This is similar to the velocity dispersion profiles.