Fig. 2

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Initial kinetic energy and the age of the cluster. (a) Initial kinetic energy of fragments as a function of the age of the nominal cluster. The position of the minimum, indicated by the arrow, corresponds to the actual age of the cluster, which is 2.28 days. (b) Histogram of ages for cluster clones. The arrow corresponds to the mean value and dotted lines represent the ±2σ interval.
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