Fig. 5.
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Evolution of Ysurf in model K2-MZvar-TM (solid red line) and a non-accreting model from KG21 with standard atomic diffusion (i.e., no overshooting and with turbulent mixing; dashed gray) starting with a high Yproto value within the range suggested by Serenelli & Basu (2010, blue shaded region). Turbulent mixing suppresses gravitational settling and thus leads to a reduced Yproto value.
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