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Concentration(ppb) <br /> O O O O O O O O <br /> 8/20/1997 <br /> 10/20/1997 <br /> 12/20/1997 <br /> 2/20/1998 <br /> 4/20/1998 - <br /> 6/20/1998 <br /> 8/20/1998 <br /> 10/20/1998 <br /> 12/20/1998 <br /> 2120/1999 <br /> 4/20/1999 - <br /> 6/20/1999 <br /> 8/20/1999 <br /> 10/20/1999 <br /> 12/20/1999 <br /> 2/20/2000 <br /> 4/20/2000 - <br /> 6/20/2000 - n <br /> 8/20/2000 - <br /> 10/20/2000 <br /> 1 212 0/2 000 <br /> 2/20f20010 <br /> 4/20/2001 O <br /> 6/20/2001 <br /> 8/20/2001 m <br /> 10/20/2001 I <br /> 12/20/2001 <br /> 2/20/2002 cvp <br /> 4/20/2002 'm <br /> 6/2012002 - <br /> 8120/2002 <br /> 10/20/2002 <br /> 12/20/2002 <br /> 212012003 - <br /> 4120/2003 - <br /> 6/2012003 <br /> /20/20034/20/20036/20/2003 <br /> 8/20/2003 <br /> 10/20/2003 <br /> 12/20/2003 <br /> 2/20/2004 - <br /> 4/20/2004 <br /> 6/20/2004 - <br /> 8/20/2004 - <br /> 10/20/2004 <br /> /20/2004 8/20/200410/20/2004 <br /> S <br />