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rr r� rl r <br /> Methylene Chloride <br /> 2.5 <br /> 2 <br /> ■ Mw-1 <br /> 1.5 MW-2 <br /> —.— MW-3 <br /> MW-4 <br /> 1 <br /> - MW-5 <br /> �— SS-1 <br /> 0.5 <br /> 0 01 01 <br /> Jan-88 Jan-89 Jan-90 Jan-91 Jan-92 Jan-93 Jan-94 Jan-95 <br />