Fig. 8
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Evolution of particles born within the spiral arm around ϕ ~ 180° at time 8.445 Gyr. Grey shaded areas show spiral arms of stars younger than 0.5 Gyr defined by D ≤ 1.9. Blue dots are stars that have remained inside arm regions, while orange crosses show stars having left the arms region at least once. The disc rotates in the direction of increasing azimuth.
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