Fig. 4.
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Evolution of type II SNe 1999em (Leonard et al. 2001) (red) and 2013ej (Valenti et al. 2013) (orange) and type IIb SNe 1993J (Barbon et al. 1995) (blue) and 2011dh (Valenti et al. 2013; Ergon et al. 2014) (purple). The epoch of each of the spectra is computed from the explosion date. The dotted vertical line marks the rest-wavelength corresponding to Hβ; the dashed line is the He I λ5876 feature, and the continued line is Hα.
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