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— PCE • Detection <br /> TCE Mw-209B X Non-Detect <br /> c12DCE <br /> 70 <br /> 1 <br /> 60 11 <br /> r � <br /> lti <br /> 50 CD <br /> 1 � <br /> 1 ► <br /> 1 <br /> 40 r <br /> O <br /> 1 � <br /> 30 +r ti <br /> V i <br /> O <br /> u 20 II/ i <br /> 10 <br /> ► i <br /> p -c—)+-x—X- <br /> - <br /> 2000 2005 2010 2015 2020 <br /> Year <br />