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Fig. 2

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Surface nitrogen abundance as function of the fractional main sequence lifetime for two specified stellar models (see legend) from the detailed stellar evolution grids of Brott et al. (2011a) (red lines), compared to the results of our fit (blue solid lines). The blue dashed lines represent error ranges of  ± 0.1 and  ± 0.2 dex for the nitrogen abundance. While the left panel shows a typical fit, the right panel depicts our worst case.

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