Fig. 4. Regression tree to estimate water retention at -33 kPa from structural and consistence parameters; y, yes and n, no answers to the parameter definition in the box above. The node number in brackets, the average value of the volumetric water content at -33 kPa for the group, the standard deviation of the water content within groups in parentheses, and the count of samples in the group are shown beneath terminal nodes.

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