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where Rv(z) and Rh(z) are the cumulative relative contributions of all soil electrical conductivity with the vertical and horizontal EMI dipoles, respectively, for a homogeneously conductive media below a depth of z (m).

At low conductivity values (ECa < 100 mS m-1), McNeill (1980) showed that the measured ECa when the EMI instrument is located at the soil surface is given by Equation (2.12):

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