UVES spectrum in the region of the CH band in SDSS J2209-0028. The thin blue lines correspond to the computation of the CH band with an abundance A(C)= 6.5 and 7.5. The thick red line corresponds to A(C)= 7.1 (best fit) and the dots at the bottom of the figure represent the difference between the synthetic spectrum computed with A(C)= 7.1 and the observed spectrum (shifted upward by 0.5).
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