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0 <br /> PCE Concentration <br /> 250 - <br /> 225 ----------------------------------------------------------------------------------------------------- <br /> 200 -------------------------------------------------------- --------------------------------------------- <br /> 175 ---------------------------------------------------------------------------------------------------- - <br /> 150 ----------------------------------------------------------------------------------------------------- <br /> C <br /> O <br /> e+o 125 ..................................................................................................... <br /> r <br /> .a+ <br /> C <br /> d1 <br /> V <br /> 0 100 ..................................................................................................... <br /> U <br /> 75 ---------------------------------------------------------------------------------------------------- <br /> n <br /> on 50 ............................................ ...............---...-----............--------------- <br /> R.N <br /> p 1-& <br /> 25 ........................... ................................ .------.. ..........---...........----- <br /> � to <br /> ® 0 <br /> 11/3/88 11/3/89 11/3/90 11/3/91 11/2/92 11/2/93 11/2/94 11/2-/95 11/1/96 1111/97 <br /> Sample Date <br /> Ad_data.xls mw4 plot 11/24/98 <br /> l I I I 1 ) 1 11 1 1 1 1 1 1 1 I 1 <br />