Fig. 13
[O i]/Hα versus [O iii]/Hβ diagnostic diagram for the 6dFGS data. The demarcation lines are from Kewley et al. (2006). The solid line represents the division between Seyferts and LINERs. The dark cloud represents SDSS galaxies from a previous study by Kewley et al. (2006). Green circles represent galaxies that follow the narrow lines width criteria (see Sect. 5.1), and red squares represent those that do not.
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