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Manganese, Total <br /> 0.1 <br /> 0.09 <br /> 0.08 <br /> 0.07 <br /> 0.06 <br /> S <br /> 0.05 W-1 <br /> 13 SW-2 <br /> 0.04 <br /> 0.03 <br /> 0.02 <br /> 0.01 <br /> 0 - <br /> Jan-92 Apr-92 Jul-92 Oct-92 Jan-93 Apr-93 Jul-93 Oct-93 Jan-94 <br />