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Fig. 4.
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Velocities of SN 2021bnw measured by fitting a Gaussian to the absorption minima of the O IIλ 7774 (red dots) and from the blackbody radius RBB (blue triangles; see Fig. 11). For comparison, we also plot the O IIλ 7774 velocity of SN 2024afav (gold triangles; Kumar et al. 2026) and a ∝t−2/3 curve (dashed black line).
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