Fig. 18
Comparison of shock- and AGN-sensitive emission-line ratios [N ii]λ6583/Hα and [O i]λ6300/Hα for barred and unbarred galaxies. Galaxies that would be considered as AGN according to the [O iii]/Hβ vs. [O i]/Hα or [O iii]/Hβ vs. [S ii]/Hα diagrams and the Kewley et al. (2006) separation line are marked with blue and green circles, respectively.
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