Fig. 12.
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Galaxy α0.5 values as a function of the mass fraction of young (Age < 2 Gyr), intermediate (2 ≥ Age ≥ 10 Gyr), and old (Age > 10 Gyr) stars. Upper panels: Observations. Lower panels: Values from the simulations. The green dot-dashed lines show the best-fit regressions; fits that exclude the observational data for NGC 1351 are shown as a brown dashed line.
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