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PCE • Detection <br /> _ TCE Mw-209B x Non-Detect <br /> -� c12DCE <br /> 70 <br /> 60 <br /> 50 <br /> 40 <br /> o <br /> � � 1 <br /> -'--j 30 � I <br /> 0 t <br /> 0 <br /> U 20 <br /> 10 j <br /> 1 <br /> l � <br /> .00~ _ _ <br /> -x -x _ <br /> i <br /> 2000 2005 2010 20 15 2020 <br /> Yea r <br />