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Chloroform <br /> 0.45 <br /> 0.4 <br /> 0.35 <br /> 0.3 —'— MW-1 <br /> –� MW-2 <br /> 0.25 <br /> c —•— MW-3 <br /> w <br /> 0.2 —O— MW-4 <br /> —*— MW-5 <br /> 0.15 <br /> �— 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 />