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Electrical Conductivity <br /> 2,500 <br /> 2,000 <br /> E 1,500 <br /> —'— SW-1 <br /> 0 <br /> E SW-2 <br /> 1,000 <br /> 500 <br /> 0 <br /> Jan-92 Apr-92 Jul-92 Oct-92 Jan-93 Apr-93 Jul-93 Oct-93 Jan-94 <br />