Representation of the BPT diagram defined by Baldwin et al. (1981) to separate SFGs from AGN. The orange, blue and black dashed lines represent the Stasińska et al. (2006), Kauffmann et al. (2003) and Kewley et al. (2001) selection criteria, respectively. The red solid lines represent the Kewley et al. (2013) selection criteria for redshifts 0, 0.15, 0.3, and 0.5. The colour-coding represents the spectroscopic redshift of the objects. The average 1σ size is shown in red at the bottom left.