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Fig. 3.
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Histograms of the hardness ratio (top), and extinction (bottom) of our sample of He II and X-ray detected sources. The black dashed, and light gray continuous lines correspond to SB12 SFGs and AGNs. The gray dotted line represents sources classified as SFGs by BPT but AGNs by the SB12 diagram (NLS1s; Section 3.1).
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