UVES spectrum in the region of the CN band compared to theoretical spectra. The abscissa is the wavelength in nm, and the ordinate the relative flux. For SDSSJ1114+1828 the theoretical spectra are computed with A(C) = 8.4 and A(N) = 6.4, 6.7 (best fit), 7.0, and for SDSSJ1143+2020, with A(C) = 8.1 and A(N) = 6.9, 7.2 (best fit), 7.5.
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