Fig. 6. Data on the shrinkage curves of an aggregated clay soil from Hallaire (1984). The e_l^' values (asterisks) give the layer void ratio in Bronswijk's approximation. The e_s values (circles) give the sample void ratio. The e values (dots) give the aggregate void ratio. The e₁ values (squares) give the true layer void ratio. The e_l values (solid line) give the least squares approximation (and extrapolation) of the square points that were used in the present work. Goodness of fit of the approximation is r² = 0.975.