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Originally Posted by tony873004
"...( the disk is assumed to start just beyond the initial orbit of the outermost planet)..."
which I take to mean that Uranus & Neptune were not in the disk at the time.
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I've taken it to mean that Jupiter, Saturn, Uranus and Neptune are all initially embedded in the simulated disk (which "starts" just beyond Neptune and extends all the way to the sun). The initial migration of the planets is then driven by the disk. But when Jupiter and Saturn hit resonance, they begin "pumping" the rest of the solar system.
Grant Hutchison