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Fig. 4

Fig. 4 Refer to the following caption and surrounding text.

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Illustration of numerical integration using the fixed bin width (e.g., Newton-Cotes rectangle method; left) and the adaptive bin width (e.g., our tree method; right). In the adaptive bin width methods, the bin width becomes larger in the farther region, where the virtual distance is the mass ratio of i-dust and j-dust.

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