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Sulfate <br /> 1400 <br /> 1200 <br /> 1000 �— MW-1 <br /> ° MW-2 <br /> 800 —•— MW-3 <br /> 600 <br /> MW-4 <br /> --'— MW-5 <br /> 400 <br /> SB-1 <br /> 200 als- <br /> �--'-�. <br /> 0 <br /> Jan-88 Jan-89 Jan-90 Jan-91 Jan-92 Jan-93 Jan-94 Jon-95 <br />