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Concentration(ppb) <br /> O Q OO O O O <br /> p OOO P q O O <br /> bOOOOOOO O <br /> 8/20/1997 <br /> 10/20/1997 <br /> 1212011997 <br /> • <br /> 2/20/1998 <br /> 4/20/1998 <br /> 6/20/1998 <br /> 8/20/1998 - <br /> 10/2011998 <br /> 12/20/1998 <br /> 2/20/1999 <br /> 4/20/1999 - <br /> 6/2011999 - <br /> 8/20/1999 - <br /> 1012011999 <br /> /20/19996/20/19998/20/199510/20/1999 <br /> 12/20/1999 <br /> 2/20/2000 <br /> 4/20/2000 m <br /> C <br /> 6/20/2000 <br /> 0 <br /> 8/20/2000 - <br /> 10/20/2000 <br /> /20/2000 10/20/2000 m <br /> 12/20/2000 <br /> 2/2012001 - <br /> 412012062-- <br /> 6120120A- <br /> /20/200 <br /> 4/20/200 p <br /> 612012001' -4 <br /> M <br /> 8/20/2001 = <br /> G� <br /> 10/20/2001 <br /> 12/20/2001 I <br /> 2/20/2002 - <br /> 4/20/2002 <br /> /20/2002 4/20/2002 <br /> 6/20/2002 <br /> 8/20/2002 <br /> 10/20/2002 <br /> 12/20/2002 <br /> 212012003 - <br /> 4/20/2003 - <br /> 6/20/2003 <br /> /20/20034!20/20036/20/2003 <br /> 8/20/2003 <br /> 10/20/2003 <br /> 12/20/2003 <br /> 2/20/2004 <br /> 4120!2004 <br /> 6120/2004 - <br /> 8/20/2004 <br /> 10/20/2004 <br />