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Fig. C.1
Observed (dotted red line) and synthetic (solid blue line) spectra in the region around the 12CN and 13CN lines at ~8004 Å for ν3 CMa (top) and 19 Pup (bottom). Synthetic spectra were calculated for three 12C/13C ratios, 10.0, 22.0, and 36.0 for ν3 CMa and 10.0, 20.0, and 36.0 for 19 Pup.
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