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Fig. 8
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Fractional abundances of 13CO, HCO+, HCN, HNC, CN, N2H+, and C2H in AFGL 2298 compared to other evolved stars. Abundances are taken from Loinard et al. (2012) for η Car, Quintana-Lacaci et al. (2016) for IRC+10420, and Velilla Prieto et al. (2017) for IK Tau.
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