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Fig. 19.

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[O I] λλ 6300,6364, [O II] λλ 7320,7330, and [O III] λλ 4959,5007 line profiles at tmax+565.0 days. The velocity scale is centred on the blue doublet component in the left panel and on the red component in the right panel. [O II] and [O III] only reach out to approximately the velocity of the CSM shell (vCSM), much less than the photospheric velocity (vFeII) and the maximum velocity of the ejecta (vmax). In contrast to that, the [O I] profile extends to ⊈ 12 500 km s−1. This points to [O II] and [O III] being produced close to the CSM shell whereas [O I] is produced in the SN ejecta.

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