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Fig. 13.

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Histogram of the distribution of the average flux ratio Hα/He I λ5876 in three SNe IIb (SNe 1993J, 2011fu and 2013df, in blue), nine SNe IIL from Faran et al. (2014) (in red) and SN 2018ivc (in green) between one and three months after the explosion. The majority of SNe IIL have a Hα/He I λ5876 ratio of around 7, with some outliers, while SNe IIb have a ratio between 2 and 3. With a ratio of 8.4, SN 2018ivc would be a type IIL SN.

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