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FIG. 5. Comparison of the measured ${varepsilon}$ _r' (real component of relative complex permittivity) and ${varepsilon}$ _r'' (imaginary component of relative complex permittivity) temperature (T) response with apparent permittivity, ${varepsilon}$ _a, calculated using Eq. [3]. The Ames soil is representative of high ${varepsilon}$ _r'' soils, and the Tif5 soil is representative of low ${varepsilon}$ _r'' soils. Where ${varepsilon}$ _r'' is low, there is little impact on ${varepsilon}$ _a, and sensor type is not critical.