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Fig. 7
Evolution of the H6a index (dashed lines) and the Demarco et al. (2010) H6 index (solid lines) for BC03 models at 9 Å resolution. Unlike the older H6 index, H6a does not increase perceptibly with increasing age beyond 2.5 Gyr for Z⊙ models or 1 Gyr for 2.5 Z⊙ models.
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