Fig. A.1

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Final value of the continuous resonance index κ as a function of the rescaled surface density ∑0,gap and mp for systems with mp = m1m2/2. The inner planet is fixed at the inner disk edge, and the initial conditions are otherwise the same as in Fig. 2. The dashed black line is the gap-opening threshold. Except for a few systems, planets with masses below 10−4M⊙ that would otherwise be captured in 2:1 do not stay there due to overstability.
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