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Fig. B.12
NGC 346-355 - ON2 III(f∗). Black: hotter solution (Teff = 55 kK), supported by N iv/N v lines. Blue: cooler solution (Teff = 51 kK), mostly supported by N iii (together with N ivλ6380). Red: “average” solution (Teff = 53 kK) used in Sect. 7.
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