Time evolution of the σ1 critical argument of the 3:2 resonance during the dissipation of the disk for the super-Earth case. The libration width grows with time and finally it turns into circulation (for both σ1 and σ2) when the density of the gas declines. This leads to the break up of the resonance and a period of chaotic evolution characterized by mutual close encounters. The initial value of Σ is equal to Σ1MMSN.
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