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Concentration(ppb) <br /> 0 0 0 0 0 0 0 <br /> 0 O O 0 0 O O O <br />� 8/1/1997 <br /> 10/1/1997 <br /> 12/l/1997 - <br /> 211/1998 <br /> 2/1/1997 211/1998 <br /> ------ <br /> 4/l/1998 - <br /> 6/1/1998 - <br /> 8/111998 - <br /> 10/111998 <br /> /1/19986/1/19988/1/199810/1/1998 <br /> 12/l/1998 - <br /> 2/1/1999 <br /> 2/1/19982/1/1999 <br /> 4/1/1999 <br /> 6/l/1999 - <br /> 8/l/1999 - <br /> 1011/1999 <br /> /1/19998/1/199510/1/1999 <br /> 1211/1990 <br /> 211/2000 - <br /> 4/112000 - <br /> 6/1/2000 - <br /> 8/112000 <br /> /1/20004/1/20006/1/20008/1/2000 <br /> 10/l/2000 - 0 <br /> 12/1/2000 <br /> n <br /> 2/1/2001 m <br /> 4/1/2001 <br /> 6/1/2001 <br /> 8/1/2001 <br /> 1011/2001 <br /> 12/1/2001 I = <br /> G7 <br /> 2/1/2002 �+ <br /> 4/1/2002 - <br /> 61112002 <br /> /1/2002611/2002 <br /> 811/2002 <br /> 10/1/2002 <br /> 12/1/2002 <br /> 211/2003 <br /> 4/1/2003 <br /> 6/1/2003 <br /> 8/1/2003 <br /> 10/1/2003 <br /> 1211/2003 <br /> 2/1/2004 - <br /> 411/2004 - <br /> 6/l/2004 - <br /> 8/112004 - <br /> 10/l/2004 <br /> /1/2004411/20046/1/20048/11200a10/1/2004 <br /> 12/l/2004 <br />