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Fig. 4

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Hunter-diagram of Class 1 stars of a synthetic population of main sequence stars obtained using the STARMAKER code (Brott et al. 2011b). The surface nitrogen abundance is plotted versus the projected surface rotational velocity. The colors indicate the number of Class 1 stars in a given pixel. The absolute scaling is arbitrary. The Hunter-diagram is divided into 5 areas as in (Brott et al. 2011b) to simplify the later analysis.

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