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Fig. 12.
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Top: He Iλ5876 velocity of SN 2021efd. Bottom: Fe IIλ5169 velocity of SN 2021efd. The templates are the rolling mean of SESNe as presented by Holmbo et al. (2023); H23. The λ5876 feature they measured for Type Ic SNe is expected to be composed of Na Iλλ5890,5896 doublet, and little to no He Iλ5876.
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