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Fig. 1.
[C/N] vs. log g of 200 Myr (red line) and 2 Gyr (blue line) [Fe/H] = 0.0 dex PISA isochrones. The triangle represents the point where [C/N] starts to decrease monotonically, and the circle represents the point where the derivative d[C/N]/d log g is highest.
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