Fig. 4
Synthetic spectrum fits to the CH band in CS 22881-039 and CS 30317-056. Crosses: observations; thick line: spectra computed with no carbon; thin lines: spectra computed for log ϵ(C) = 6.5 and 7.2. The observed spectra are compatible with a complete absence of carbon; an upper limit to the abundance is log ϵ(C) ≲ 6.5.
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