516193.fig.003a
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516193.fig.003b
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516193.fig.003c
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Figure 3: AGN selection diagrams based on optical emission line ratios. Figure obtained from Kewley et al. [50]. Divisions between star-forming galaxies and AGN are shown by the dashed [51] and solid [52] lines; bona-fide AGN sit at the upper right in these distributions.