Fig. 4.
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Face-on projections of the stacked surface density distributions in the X-Y plane within a 15 × 15 kpc2 box at 1, 2, 3, 4, and 5 Gyr (top to bottom rows) for models r1c14b00, r1c14b05, and r1c14b10 (left to right columns). The blue and purple points are overlaid to indicate young stars with ages 0.01 < tage < 0.1 Gyr and tage ≤ 0.01 Gyr, respectively.
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