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Fig. 8. Simulated values of the matric potential in the Sp60B30 substrate, using the fitted K({psi})–{psi} relationship of Fig. 4b and the average measured evapotranspirative demand during the course of the experiment. The (a) {alpha}1, {alpha}2, (b) {psi}b and Ks value were varied from 0.5 to 1.5 of their fitted value.