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Sulfide <br /> 1 <br /> 0.9 <br /> 0.8 <br /> 0.7 <br /> 0.6 <br /> SW-1 <br /> 0.5 <br /> SW-2 <br /> 0.4 <br /> 0.3 <br /> 0.2 <br /> 0.1 <br /> 0 <br /> Jan-92 Apr-92 Jul-92 Oct-92 Jan-93 Apr-93 Jul-93 Oct-93 Jan-94 <br />