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Fig. 5.

image

Comparison of optical spectra for models m12, m15, m20, and m25 at about 20 d (top), 62 d (middle), and 155 d (bottom) after explosion. The color offset at early times results from the different progenitor radii. The greater O I 6300 Å line in more massive progenitors arises from their greater oxygen content.

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