Scatter plot of the inner planet period and the outer-to-inner planet period ratio. Each dot represents the final state of one particular planetary system. The color of the dot corresponds to Ṁ_g0 (orange in panel a), τ_d (green in panel b), or B_⋆ (blue in panel c), respectively. The size of the dot represents the total mass of two planets. Vertical lines mark the 2:1 and 3:2 MMRs.