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!colspan = "2" align = center| NN
!colspan = "2" align = center| NN
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Where void ratio has been estimated from the coefficient of uniformity (C<sub>U</sub>):
<math>V_{R}=0.255\left ( 1+0.83^{C_{U}} \right )</math>
Where coefficient of uniformity is the ratio of the 60th and 10th percentile grain sizes:
<math>C_U=\frac{d_60}{d_10}</math>