As in Fig. 17, each point represents a spaxel; here the points are colour-coded by their Hα velocity dispersion, whereas their shape varies depending on their location within HII regions (circles), DIG (diamonds) or strongly ionised regions (stars). The observed points are compared to fast radiative shock models from Allen et al. (2008) (shock only models for v_shock <  200 in magenta; shock+precursor models for v_shock >  200 in light green), models of star forming galaxies from Levesque et al. (2010) (solid black) and the extreme starburst line from Kewley et al. (2001) (dashed black).