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Fig. 1
Turbulent diffusion coefficient in the 170 Myr, 1.7 M⊙-model computed with TGEC. Dturb is constant from the surface down to log T = 5.3. Just below this region, Dturb is by definition 50 times larger than the He atomic diffusion coefficient (see Eq. (2)). The vertical dashed line locates the region where log T = 5.3.
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