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Trichlorofluoromethane <br /> 10 <br /> 9 <br /> 8 <br /> 7 - MW-1 <br /> b ° MW-2 <br /> 5 —•— MW-3 <br /> — MW-4 <br /> 4 <br /> —� MW-5 <br /> 3 SB-1 <br /> 2 <br /> 1 <br /> 0 <br /> Jan-88 Jan-89 Jan-90 Jan-91 Jan-92 Jan-93 Jan-94 Jan-95 <br />