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Fig. 4. Observed K({psi})–{psi} relationship in all three repitions for each individual substrate. The lines were fitted by segmented regression, using all the values for a given substrates, after a preliminary estimation of {psi}b, later recalculated from the intersection of the fitted curves. They represents the modeled K({psi})–{psi} relationship used later for the (a) Se30B60 and (b) Sp60B30 treatments.