Fig. 4. Measured soil water characteristic in Fig. 2 approximated by cubic splines interpolation using one virtual point [(, h) = (0.31, -30)] (solid line), and with one datum near 0.1 cm³ cm^-3 shifted using the virtual point [(, h) = (0.088, -107)] together with the virtual point [(, h) = (0.31, -30)] (broken line). RMSE is root-mean-square error

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