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Fig. 6.

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Trends with redshift of age (a), stellar mass (b), tau parameter (c), and metallicity (d), colour-coded by stellar mass. In the age–redshift the lines in the background represent the theoretical trends in a flat ΛCDM cosmology with ΩM, 0 = 0.3, ΩΛ, 0 = 0.7, H0 = 70 km s−1 Mpc−1, and different formation redshifts.
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