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Fig. 5.
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Detailed emission line identification in the mean spectrum close to He IIλ4686. We identify N IIIλ4640 and C IVλ4658 (Osterbrock & Cohen 1982) and further labelled the position of the Fe II (37, 38) emission bands (for a template of Fe II, see Park et al. 2022) as well as [Ar IV] λλ4712, 4740.
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