Evolutionary tracks for a 3 M⊙ model showing the effects of a small change in the initial hydrogen abundance. The dashed and dotted lines indicate models in which the initial hydrogen abundances has been reduced and increased by 0.01, respectively. Evolutionary tracks for models of 2.94 and 3.06 M⊙ are shown in red. Pluses mark ages of 30, 200 and 300 Myr.
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