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Fig. 1


Variations of the size of the convective envelope (in solar mass, color-coded) along the track of the 2 M, Z standard model. The dotted line corresponds to the phases when the convective envelope contains less than 0.001 M. Specific evolution points are selected. On the PMS, the green, black, and red squares correspond respectively to stages when the star is still fully convective, and when the mass of the receding convective envelope is 1.9 and 0.26 M. In the advanced phases, the magenta, cyan, black circles correspond respectively to the beginning, middle, and end of the first dredge-up, that is, when the mass of the convective envelope is 0.13, 0.87, and 1.7 M. Red circle, green and blue triangles correspond to the RGB tip, to the middle of central helium-burning, and to the end of the second dredge-up on the early-AGB, respectively; at these evolutionary points the mass of the convective envelope is respectively 1.39, 0.7, and 1.31 M.

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