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Fig. 3

image

Distribution of the initial semimajor axes of the outer planet of a massive pair () trapped in a 2:1 resonance for different values of the disk gas density Σ. For higher densities the resonant region is shifted inwards. The volume of the phase space is also reduced and the size of the resonance region shrinks. This is revealed by the smaller areaof the Gaussian curve fitting the histogram.

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