Fig. 3

From top to bottom: face-on density distribution of stars of various birth radii: rini ≤ 0.4rbar; 0.4rbar ≤ rini ≤ 0.7rbar; 0.7rbar ≤ rini ≤ rbar; rbar ≤ rini ≤ 1.3rbar; 1.3rbar ≤ rini ≤ 1.6rbar; 1.6rbar ≤ rini ≤ 1.9rbar. Different columns correspond to different times, as indicated. In each panel, the average initial radius is indicated by a white circle.
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