Fig. 7
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Spectral morphology during the IIn phase that results from a range of ionization of the unshocked CSM, from cool weakly ionized conditions at the top to hot and highly ionized conditions at the bottom. The models shown here differ in ejecta and CSM configuration and in post-breakout time. In all cases, He II 6560.1 Å is a contaminant to the Hα emission.
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