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Fig. 5

image

Same as Fig. 4, but for a test simulation with no outer disc, that is, showing only the dynamical outward motion of the grains released by the initial breakup event at 10 au. It can be clearly seen that the front of this outward propagation is, after only 40 yr, already well beyond 200 au (we show the radial profiles up to t = 40 yr instead of the 70 yr of Fig. 4, because there are no high-β initial grains left in the <200 au region after 70 yr).

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