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Fig. 7.

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Global plasma parameter, Γ ¯ $ \overline{\Gamma} $, as a function of age for different metallicities. The solid lines show the same models as those represented in Figure 6, i.e., models computed at Z = 0.02 metallicity. Dashed lines represent high-metallicity models (Z = 0.03), whereas dotted lines represent low-metallicity models (Z = 0.01).

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