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Dichlorodifluoromethane <br /> 80 <br /> 70 <br /> 60 <br /> ■ MW-1 <br /> 50 ❑ <br /> MW-2 <br /> —•— <br /> 40 MW-3 <br /> —0 MW-4 <br /> 30 -- MW-5 <br /> �— SB-1 <br /> 20 <br /> 10 <br /> 0 <br /> Jan-88 Jan-89 Jan-90 Jan-91 Jan-92 Jan-93 Jan-94 Jan-95 <br />