Same as Fig. 2, except for the composite prototype LIRG NGC 5135. This galaxy is the only example where all different types of regions are identified: circumnuclear young, and SNE-dominated, star-forming clumps, compact and extended AGN regions (traced by the [SiVI]1.96 μm emission line and shown by contours in top panels), and general diffuse ISM. All these different regions, i.e. excitation mechanisms, occupy different and well-separated areas in the log([FeII]1.64 μm/Brγ) − log(H₂ 2.12 μm/Brγ) plane (lower middle panel).