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rr rr r rr ® rr ar <br /> Zinc, Dissolved <br /> 0.5 <br /> 0.45 <br /> 0.4 <br /> 0.35 - ■ MW-1 <br /> 0.3 �— MW-2 <br /> c. —.— MW-3 <br /> � 0.25 <br /> 0— MW-4 <br /> 0.2 <br /> �- MW-5 <br /> 0.15 SB-1 <br /> 0.1 <br /> 0.05 <br /> 0 <br /> Jan-88 Jan-89 Jan-90 Jan-91 Jan-92 Jan-93 Jan-94 Jan-95 <br />