Fig. 3. Bulk density of three Glenelg soil samples from the 0.00- to 0.30-m depth plotted as a function of the applied stress. The data are for an undisturbed core sample (stars) and for two disturbed samples at different initial water contents (triangles and squares). See Table 1 and legends for initial conditions and additional information. The smooth lines result from nonlinear fits based on (a) Eq. [5], (b) Eq. [3] with n₁ and n₂ as in Eq. [8], (c) Eq. [3] with optimized n₁ and n₂ values, and (d) Eq. [1]. Optimized values for fits in (a), (b), and (d) are in Table 3, Table 2, and Table 1, respectively, and for (c) are b = –1.43, c = –1.26, cc = 0.00121, f = 0.753, and n₂ = 0.165, with all other coefficients set to zero.