Diagnostic diagram [Ne V]/[Ne II] versus [Ne III]/[Ne II] comparing Cen A's nuclear ratios with literature Seyferts, type 2 QSOs, and LLAGNs. For IC 5063 we include the nuclear and integrated 2–3 kpc ratios. The shock+AGN model track (solid red line) is from Feltre et al. (2023) and the two MAPPINGS V shock models with precursor with the parameters used in that work and two values of the transverse magnetic field of 1 and 10 μG are from Alarie & Morisset (2019) (dashed orange and dotted brown lines, respectively). Numbers next to the curves indicate the shock velocities. See text for more details.