Fig. 3.

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Spectral synthesis fits (dotted curves) of the C2 features around 4740 Å obtained with the adopted C abundance and 12C/13C value (dotted curve). The observed spectrum is shown by a solid curve. Two alternative fits with 12C/13C ∼ 1 (short-dashed line) and 12 (long-dashed line) are shown to illustrate the sensitivity of the line strengths to the isotopic carbon abundance ratios.
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