Observed (dotted red line) and synthetic (solid blue line) spectra of the star HD 87109 in the region containing the 12CN and the 13CN molecular lines. In the synthetic spectra we show the synthesis for three values of 12C/13C ratios, 12.0, 21.0, and 36.0. The light blue solid line shows the spectrum of the hot star used to map the telluric water lines.
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