Fig. 18.

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12C/13C vs. log(N/O) for core He-burning stars in our sample (left panel) and vs. log(N/O) derived by APOGEE DR17 (right panel) compared to the BGM simulations including the effects of thermohaline mixing. Thin and thick disc stars according to their Gaia kinematics are represented by the orange and blue symbols. The same colour-coding is used in the BGM simulation.
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