UVES spectrum in the region of the CN band of SDSS J1143+2020. The abscissa is the wavelength in nm, and the ordinate is the relative flux. In the top panel the observed spectrum (crosses) is compared to 1D theoretical spectra computed with A(C)= 8.1 (best fit for the CH band in 1D) and A(N)= 6.9, 7.2 (best fit), 7.5. In the bottom panel the observed spectrum is compared to 3D theoretical spectra computed with A(C)= 7.4 (best fit for the CH band in 3D, see Fig. 3) and A(N)= 4.6, 4.8 (best fit) and 5.0.
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