UVES spectrum in the region of the CH band in SDSS J111407+182831 compared to theoretical spectra computed with A(12C) = 8.4 and 12C/13C equal to either 10 (thin blue line) or 60 (thick red line). The abscissa is the wavelength in nm, and the ordinate the relative flux. The 13C feature is not visible in the observed spectrum, and we derived for this star 12C/13C ≥ 60.
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