1. Introduction
2. Galaxy Sample
2.1. MAGNUM galaxies
2.2. Data analysis
3. Gas Properties: Disc versus Outflow
3.1. Extinction, density, and ionization parameter
3.2. Spatially and kinematically resolved BPT
4. Discussion
4.1. Possible scenarios for the lowest LILr
4.2. Possible scenarios for the highest LILr
5. Conclusions