Fig. 14
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Evolution of the He I 5876 Å (upper panel) and He I 1.083 μm (lower panel) lines for SN 2020acat (red) and the JEKYLL models (black) with an initial mass of 17 M⊙, strong expansion of the radioactive material, medium mixing plus XH =0.54 (left), strong mixing plus XH = 0.54 (middle), and strong mixing plus XH = 0.27 (right). The figure is otherwise the same as Fig. 13.
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