Fig. 2.
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Evolution with time of the superficial abundance of Ca for the 1.5 M⊙ model with various mass-loss rates (10−13, 3.1 × 10−14, and 10−14 M⊙ yr−1, shown by the black, red, and blue curves, respectively). The abundances are expressed as the logarithm of the ratio of the current mass fraction and the initial one. The thin dotted curve represents the initial abundance.
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