Fig. 10
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Fraction of stars within spiral arms (D ≤ 1.97, solid) or interarms (D ≥ 2.06, dashed) as a function of time elapsed since their initial selection. We include times between 8.25 and 8.75 Gyr. Dark lines trace particles that are born at the initial time, while lighter ones trace particles that are 1–3 Gyr old and 5–7 Gyr old initially.
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