Radial distribution of the [S II]/Hα ratio of the DIG bins (green), and H II regions according to our definition (red), obtained as the ratio of the mean values of the respective fluxes within a ring of width 0.05R₂₅ with a step of 0.05R₂₅ from 0.2R₂₅ to R₂₅. We are only considering those bins whose relative error in [S II] and Hα lines are lower than 40%. To avoid the strong AGN emissions, we start all the distributions from 0.2R₂₅. In general we see a tendency to increase the ratio as we move to outer regions of the galaxy. Besides, the ratio is in all cases higher in DIG regions, as we expected from the literature (Haffner et al. 2009).