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Chloride <br /> 400 <br /> 350 <br /> 300 — <br /> �— MW-1 <br /> 250 -u MW-2 <br /> v 200 —• MW-3 <br /> E �— MW-4 <br /> 150 _ MW-5 <br /> �- SB-1 <br /> 100 <br /> 50 <br /> 0 <br /> Jan-88 Jan-89 Jan-90 Jan-91 Jan-92 Jan-93 Jan-94 Jan-95 <br />