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The time evolution of <u2> for an interfacial string atom undergoing cooperative motion showing avalanche events and the distribution of singular avalanche events P(<u2>). Left: <u2> for a string particle over a timescale over which the strings persist for a Ni NP having N = 2899 and T = 1000 K. Right: Probability distribution function of <u2> of atom 2, where P(<u2>) ~ (<u2>)−γ and γ ≈ 3.0 for this atom.
