Fig. 12
Diagram of C4C3 vs C34 presenting photoionization models of AGNs (red; Feltre et al. 2016) and star-forming galaxies (SFGs; blue; Gutkin et al. 2016). The separating line of Eq. (1) consistently divides the two populations,with a small region where metal-poor, highly ionized galaxy models could contaminate the AGN area (gray shaded) as we also indicate in Fig. 11.
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