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Analyzing void-void spacings is more complicated than the paste-void spacing measurements. As pointed out by Lu and Torquato, the void-void spacing distribution is a function of both s and r. For a lognormal distribution of sphere radii there exists a unique void-void spacing distribution for each sphere in the system. Also, estimating the average void-void spacing is difficult since only one measurement exists for each sphere, and that exact sphere diameter will not be duplicated in the system. An indirect means to estimating the average void-void spacing is presented and used here.