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Fig. 6

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Examples of spectral synthesis applied to the CN (top panel) and CH (bottom panel) molecular bands. Solid black curves represent the observed spectra for star WFI 512115, thick grey curves represent the best fitting synthetic spectra, while thin grey lines represent synthetic spectra differing from the best fit by  ± 0.2 dex in the N (top panel) and C (bottom panel) abundances.

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