Fig. B.1
Models with Z0 = 0.0001. The curves are identified in the figure by the mass of the HB model. The color code is the same as used for the left panel of Fig. 2 and is defined in footnote [5]. Zero age HB is defined as the moment when X(12C) reaches 0.04. In the figures the curves are not all very precisely aligned to that value. X0(surfFe) identifies the Fe mass fraction in the original main-sequence model, similarly for the other species.
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