Fig. 1
Emission line diagnostic diagram (BPT diagram) for the whole sample of NELGs. The curve separating the AGNs from the non-AGNs (bottom left) zone is taken from Kauffmann et al. (2003). Symbols change in both form and colour according to the hard X-ray luminosity, LX. To avoid confusion, only the mean errors are reported (bottom right). The estimated errors increase with decreasing log[NII]/Hα.
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