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Manganese, Dissolved <br /> 1.6 <br /> 1.4 <br /> 1.2 <br /> —■-- MW-1 <br /> 1 MW-2 <br /> _ —.— MW-3 <br /> 0.8 <br /> —�— MW-4 <br /> 0.6 �— MW-5 <br /> — SB-1 <br /> 0.4 <br /> ■ <br /> 0.2 <br /> 0 <br /> Jan-88 Jan-89 Jan-90 Jan-91 Jan-92 Jan-93 Jan-94 Jan-95 <br />