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Fig. C.1

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Least-,χ2 fit (red) to H8 in the spectrum (black) composed of NC (green) and BC (purple), plotted with a vertical offset of 2 × 10−16 erg s−1 cm−2 Å−1. The data after subtracting this composite fit is shown in blue, revealing the He I emission at 3889.75 Å.
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