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The results of the Pleau and Pigeon equations for monosized spheres are shown in Table 2. Even though the renormalization parameter K'(0) was in error at a sphere volume fraction of 0.28, there was negligible difference in the performance of KA and KK' in estimating the 50 th percentile, for which, at a volume fraction of 0.28, both equations are in error by nearly a factor of two. At the 95 th percentile, the equation KK', which uses the incorrect estimate of the air content, performs noticeably better than KA, but is still in error by nearly a third at a volume fraction of 0.28.