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Fig. 2
The temporal evolution of Neptune’s semimajor axis for the planetesimal disk with a total mass of 30 M⊕ and a surface density decaying as a-1 between 10 and 30 AU. The planetesimal disks are assumed to be composed of N = 1000 (green), 2000 (red) and 3000 (blue) equal-mass particles, respectively.
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