Fig. C.1.
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Spectral comparison with other Type II SNe at three different phases. The data for the comparison SNe were taken from Singh et al. (2024), Michel et al. (2025) for SN 2023ixf, Hamuy et al. (2001), Leonard et al. (2002) for SN 1999em, Hosseinzadeh et al. (2022), Nagao et al. (2024) for SN 2021yja, and Reynolds et al. (2025a) for SN 2021irp, via the Weizmann Interactive Supernova Data Repository (WISeREP; Yaron & Gal-Yam 2012).
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