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PCE Concentration <br /> 250 - <br /> 225 -------------------------------------•-----------------------....------------------------------------ <br /> 200 ------------------------------------ -._...----------...-.------.......------------------..--------.--- <br /> 175 ---------------------------- ------------------------------------------------------------------------- <br /> 6 150 ---------------------------- ------------------------------------------------------------------------- <br /> c <br /> 0 <br /> 125 ----------------------------------------------------------------------------------------------------- <br /> c <br /> a� <br /> v <br /> 0 100 ...................................................................................................... <br /> V <br /> onp 50 ............................................... ----------------- --------- ------------------- <br /> N t� <br /> N25 ---------- ---------------------------------------------------------- -- ------- ------------------- <br /> r. <br /> -- --- ------.r. lob <br /> & 0 <br /> 11/3/88 11/3'/89 11/3/90 11/3'/91 11/2/92 11/2,193 11/2/94 11/2/95 11/1/96 1111/97 <br /> Sample Date <br /> Arl_data.xls mw10 plot 11/24/98 <br />