Evolutionary tracks for a 1 M⊙ model showing the effect of a small change in the total metallicity, Z. The solid line indicates the calibrated model, while the dotted and dashed lines show models where Z has been decreased and increased by 10% respectively. Pluses mark ages of 500 Myr, 4.57 Gyr and 10 Gyr. The red circle represents the location of the Sun. Red lines mark stellar tracks with masses of 0.98 M⊙ and 1.02 M⊙.
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