EWαn2 criterion defined by Cid Fernandes et al. (2010) for the classification of SFGs and AGN. The Stasińska et al. (2006) criterion (blue dashed line) has been adopted for the separation, as it is the most restrictive for SFGs. The Kauffmann et al. (2003, red dashed line) and Kewley et al. (2006, black dashed lines) criteria are also shown. The colour-coding represents the spectroscopic redshift of the objects. The average 1σ size is shown in red at the bottom-right.