Fig. 4 Apparent relative permittivity, _a, in relation to the real component, ^'_r, using more complete Eq. [4] and [5] for analysis of the time domain reflectometry traces: (a) = Temora A horizon; (b) = Temora B horizon. In the legends, the first letter indicates the soil horizon (A or B), the next symbol(s) indicate the wetting solution (W = water, S1 = KCl solution once, and S2 = KCl solution twice). The lines are 1:1