Fig. 7.
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Evolution of the expansion velocity of SN 2024iss measured from spectral features of Hα, Hβ, Hγ, He I, Fe II, and Ca II. The dashed vertical gray line marks the epoch of V light-curve peak brightness. Photospheric velocities inferred from the absorption minima of Balmer and He I λ5876 lines appear to be faster than those from other spectral features.
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