Fig. 1
Histogram of the outer-to-inner planet period ratio. The upper and lower panel show the results from the migration (red) and the in-situ (blue) scenario, respectively. In each scenario, both the initial (light) and final states (dark) of the simulations are given. The black line is the observation data for comparison. Vertical lines indicate the 2:1 and 3:2 MMRs.
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