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Fig. 1.

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Variation over time of the mass of the central region of the star mixed by convective currents of a model star with an initial mass of 2.5 M and solar metallicity during the hydrogen burning phase. The various lines correspond to the different values of ζ adopted in the calculations: ζ = 0 (black line), ζ = 0.02 (red), ζ = 0.04 (blue) and ζ = 0.06 (green).

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