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TPH-G CONCENTRATION (UGIL) <br /> cs, o cn � _cNr, o rs o c� <br /> O OO p O i, <br /> O O O Q O C7 O O C7 O <br /> May-91 <br /> Nov-91 <br /> May-92 <br /> Nov-92 <br /> May-93 <br /> Nov-93 <br /> May-94 <br /> Nov-94 <br /> May-95 2� <br /> Nov-95 0 <br /> Z <br /> May-96 0 <br /> v Z <br /> Nov-96 <br /> May-97 <br /> O <br /> Nov-97 z <br /> N <br /> May-98 Z <br /> m <br /> Nov-98 <br /> May-99 <br /> Nov-99 <br /> May-00 <br /> Nov-00 <br /> May-01 <br /> Nov-01 <br /> qp <br /> i <br /> 0 <br /> 2 <br /> L7 <br /> r , <br /> `r� u <br />