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Fig. 4
Example of the 13C features used for evaluating the 12C/13C isotope ratio. Solid gray line shows the synthetic spectrum assuming log 12C /13C = 1.3, value typical for unmixed giants (Spite et al. 2006), solid red line shows log 12C /13C = 0.8, and dashed blue lines show ratios ±0.2 from that value.
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