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Fig. 7.
Temporal evolution of stellar surface metallicity, Zsurf, normalized to initial metallicity, Zini, with Mfinal = 1 M⊙, ξ = 0.1 and XD = 28 ppm. At first Zacc = Zini, whereas Zacc = 0 during the last 0.03 M⊙ (shaded). The approximate solution of Zsurf (red, solid line) well matches the full simulation (green, dashed line).
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