Fig. 2.
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Semitransparent visualization of the intersection boundary between Seyferts and LINERs in the [N II] BPT diagram. The nonlinear line in blue represents a simple outline of the intersection boundary determined by visual inspection. The plus signs in orange and hollow squares in dark green represent the Seyferts and LINERs that have been classified in both the [S II] and [O I] BPT diagrams, respectively.
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