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Silver, Dissolved <br /> 0.02 <br /> 0.018 <br /> 0.016 <br /> 0.014 —'— MW-1 <br /> 0.012 —°— MW-2 <br /> ® —.— MW-3 <br /> 0.01 <br /> —�— MW-4 <br /> 0.008 MW-5 <br /> 0.006 S&1 <br /> 0.004 <br /> 0.002 <br /> 0 <br /> Jan-88 Jan-89 Jan-90 Jan-91 Jan-92 Jan-93 Jan-94 Jan-95 <br />