Fig. 4
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Number N of moonlets as a function of time. The color is the frequency of collisions in collisions per day. It takes into account all moonlets. Simulations ran until t = 11 000 years. All simulations reach N < 10 but fragmentations can then temporarily grow N back to a few hundreds, as is seen by the spikes. Zoom-in of unclear parts of the figure are shown.
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