HI velocity dispersion measured using ^3DBAROLO (filled and empty circles) for our galaxies with a common sampling of about 400 pc (for NGC 2841 we show one data point every two). The best-fit models (Eq. (11)) are shown by the light blue curves, whose parameters (σ_HI, 0 and R_σ) are reported in a box in the lower left corner of each panel. The points indicated by empty circles are excluded from the fit.