Diagnostic Baldwin, Phillips, Telervich (BPT) diagram (Baldwin et al. 1981; Veilleux & Osterbrock 1987) of [OIII]/Hβ vs [NII]/Hα line ratios, for the narrow (left panels) and broad (right panels) components of the ionised gas. Solid and dashed black lines are empirical curves derived by Kewley et al. (2001) and Kauffmann et al. (2003), that separate different excitation mechanisms, marked on the plots as SF (star formation) and AGN. The spaxels are coloured depending on their distance from the separation lines, and are plotted with the same colours in the spatially resolved maps (bottom panels). The black star marks the AGN position.