Spaxel-by-spaxel BPT diagrams. The empirical demarcation line between pure star formation and composite excitation is dashed (Kauffmann et al. 2003a). The solid curved line corresponds to the distinction between the excitation due to starbursts and that due to other mechanisms (Kewley et al. 2001). The empirical Seyfert-LI(N)ER line is the one from Schawinski et al. (2007). The colour coding indicates the distance to the centre, in units of R_eff.