Fig. 2
UVES spectra (black line) compared to synthetic spectra of isotopic species: 12C14N (green line), 12C15N (red line), and 13C14N (blue line). The synthetic spectra are computed with the adopted isotopic abundances. The lines of 12C15N and 13C14N are identified by the red ticks and the blue ticks, respectively, and a few R lines are indicated by their quantum number.
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