Volume-weighted distributions of the [N II]/Hα line ratios resulting from our ELG BPT classification. The criteria to separate SF ELGs from the rest, solely based on the ratio [N II]/Hα proposed by Stasińska et al. (2006, S06) is shown by a vertical dashed line, log([N II]/Hα) = −0.4. Our sample is better separated by a slightly different value, log([N II]/Hα) = −0.3, also indicated by a vertical solid line. Note that we do not apply any of these two cuts in our analysis.