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Fig. 17.

Fig. 17. Refer to the following caption and surrounding text.

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Top: Luminosity–stretch diagram colour-coded by Eγ, iso. The dashed line is the best fit from (Klose et al. 2019). Bottom:Ek, SNEγ, iso plane, colour-coded by T90. Data are from (Cano et al. 2017b) and have been updated with recent results (Klose et al. 2019; Dainotti et al. 2022; Kann et al. 2024a; Dong et al. 2025). For SN 2018fip, the error on Ek, SN obtained via the Arnett modelling extends up to the one obtained by the spectral modelling and spherical approximation.

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