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Fig. 7
Observed (dotted red line) and synthetic (solid lines) spectra in the region around the 12CN and 13CN lines at ~ λ8004 Å. Synthetic spectra were calculated for four 12C/13C ratios, 3.6, 4.2, 6.0, and 10.0. The light blue solid line shows the spectrum of a hot star used to map the telluric H2O lines.
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