Determination of the radii of the zones of the enhanced gas and stellar velocity dispersions. Panel a: observed (non corrected for the instrumental profile) gas velocity dispersion σ_gas, obs as a function of radius for individual spaxels (blue points) and median values of σ_gas, obs with the mean deviations (red points and bars) for intervals corresponding to the width of 1 spaxel. The broken line is the fit to the median values of σ_gas, obs. Panel b: same as panel a but for the observed stellar velocity dispersion σ_star, obs.