Distribution of [O III] luminosity. Top panel: distribution of [O III]λ5007 luminosity for barred and unbarred galaxies. Bottom panel: distribution of L[O III]/L_r,fibre for barred and unbarred galaxies. In both panels, the continuous red line represents the distribution for barred galaxies, while the dashed blue line is the distribution for unbarred galaxies. Neither test allows us to claim the existence of differences in the distributions of these parameters regarding morphology.