BPT diagrams for the intermediate and very broad components with models of AGN photoionization (upper panels) and shocks (lower panels) with solar metallicity. The AGN photionization models have a gas density n_e = 10⁵ cm⁻³, and the α and logU parameters vary in the same range as described in Fig. 6. The shock models have a pre-shock gas density of n_e = 10³ cm⁻³, the dashed lines indicate models with constant shock velocity v_s (ranging in the interval 100–1000 km s⁻¹, from left to right), and the solid lines refer to models with a constant magnetic parameter B (ranging in the interval 0.01–1000 μG, from bottom to top). The solid and dashed black lines are the same as in Fig. 6.