Spaxel BPT diagram of ESO 580-49. Each data point corresponds to the spectrum of a single spaxel, where the individual emission lines are detected with a S/N of at least 3. The GRB explosion site, the galaxy centre, and the H II region average are indicated by large symbols as shown in the legend. The differentiation line between AGN (or shock) and stellar ionization (Kewley et al. 2013) is shown by the dashed line. The solid line denotes the ridge line of local galaxies, i.e. the line with the highest density of SDSS galaxies (Brinchmann et al. 2008).