Fig. 2
Age distribution of stellar populations in passive galaxies at different redshifts. Different colors of solid line represent the galaxy with different e −folding time scales τ (τ = 0.01,0.10,0.50,0.70, and 1.0 Gyr). The vertical dotted lines in each panel represent the lower and upper age limits for the age of 0.5 and 3.0 Gyr, which are obvious for the binary interactions.
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