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Graph 4 <br /> MTBE Goncentatcons vs Tune <br /> Former BP Oil 11192 <br /> 200000 50 <br /> 150000 50 <br /> a <br /> o <br /> S-6 <br /> -- —VW-2 <br /> 0 <br /> Q 100000 50 <br /> w <br /> 5000050 <br /> 050 <br /> Apr-90 Jan-93 Oct-95 Ja198 Apr-01 Jan-04 <br /> Tune <br />