Fig. 2. Plot of the coefficient n versus the coefficient m (data points) from Eq. [1]. The smooth curve is the best fit (Eq. [8]) for the 120 soil samples. The inset shows greater detail for 0.02 < m < 0.22. The four circled points belong to the soil sample mixture containing one part Hagerstown and four parts sand (1 Hagerstown/4 sand) and are discussed in the text.