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PCE • Detection <br /> TCE Mw-204B X Non-Detect <br /> = r c12DCE <br /> 20.0 <br /> 17.5 <br /> 15.0 <br /> 12.5 <br /> c <br /> O j <br /> 10.0 <br /> r <br /> v <br /> 0 7.5 i 1 <br /> � I r <br /> 1 <br /> 5.0 I <br /> I <br /> 2.5 <br /> 0.0 <br /> 1998 2000 2002 2004 2006 2008 2010 2012 <br /> Year <br />