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PCE Concentration <br /> 1 <br /> 225 - <br /> 200 ---------------------------------------------------------------------------------------------------- <br /> 175 ...................... ............................................................................. s . <br /> s <br /> 150 ..................... .................... ............................................... .......... <br /> c125 --•--•--------------- -•-------------- <br /> 0 <br /> •• <br /> m 100 ...................... ..........._...._.._...._.............._........--_------....---•-.._...- <br /> _.. <br /> v <br /> c <br /> 0 <br /> V <br /> 75 ----------------------------------- -----------------------.-.-----.-..---------------------------- <br /> 50 ..................................... .....-.-----------I................. .---.............. <br /> 25 --------------------------------------------------------------- ........... .. .................. <br /> y <br /> (Qn <br /> p 0 <br /> O Nov-88 Nov-89 Nov-90 Nov-91 Nov-92 Nov-93 Nov-94 Nov-95 Nov-96 Nov-97 <br /> � W <br /> Semple Date <br /> J <br /> Arf_data.xis mw1 plot 11124/98 <br />