Fig. A.1.
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The position on OIII/Hβ vs OI/Hα BPT diagram of selected SDSS galaxies with X-ray nuclear emission. Empirical lines (dashed blue and solid red) that separate LINERs from Seyfert galaxies are from Kewley et al. (2006). The green empirical line ([OIII]/Hβ < 0.64 + 1.18 ⋅ OI/Hα) separates "true" LINERs from “doubtful” galaxies.
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