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PCE Concentration <br /> 250 - <br /> 225 ----------------------------------------------------------------------- ------------------------------ <br /> 200 .... ................................................................................................. <br /> 175 ................................................. ................................................. .. <br /> 150 ..................................................................................................... <br /> v <br /> 0 <br /> 125 ..................................................................... ................................ <br /> c <br /> u <br /> c100 ..................................................................... ................................ <br /> V <br /> 75 ------------------------------ ----------..........-----.......------------------------------------- <br /> 50 ----------------------------------------------------------------------------------------------------- <br /> 25 - <br /> ------------------------------------------®----.......---------------------------------------------- <br /> 0 <br /> V! VI <br /> - ® 0 PLO, <br /> $ p 11/3/88 11/3/89 11/3/90 11/3/91 11/2/92 11/2193 11/2/94 11/2/95 11/1/96 11/1/97 <br /> at Sample Date <br /> Art data.xls mw5 plot 11/24/98 <br />