file:determination-of-water-resistivity_fig2.png|{{figure number|2}}Example of a reverse SP deflection.<ref name=pt04r3>Dewan, J. T., 1983, Essentials of modern open-hole log interpretation: Tulsa, OK, Penn Well Books.</ref> | file:determination-of-water-resistivity_fig2.png|{{figure number|2}}Example of a reverse SP deflection.<ref name=pt04r3>Dewan, J. T., 1983, Essentials of modern open-hole log interpretation: Tulsa, OK, Penn Well Books.</ref> |