Comparison between the spectrum of a normal (red line; APOGEE_ID: 2M12251747+1450078, Teff = 4713.9 K, log g = 2.24, ξt = 1.86 km s−1, [Fe/H] = −1.17 dex, and S/N = 637.8) and our N-rich star (black line) with similar stellar parameters and similar metallicity. The gray vertical bands indicate the positions of 12C14N lines.
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