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Concentration(ppb) <br /> 0 0 0 O <br /> 1011187 <br /> 212/88 - <br /> 6/24188 - <br /> 1118/89 - <br /> 10112/89 - <br /> 12113/90 - <br /> 3/13/91 <br /> 12/886/24188111818910/12/8912/13/903/13191 <br /> 6/17/91 <br /> 3/16/92 - <br /> 612192 - 0 <br /> � n <br /> 9/17/92 0 <br /> 00 12/15/92 y <br /> m = O <br /> 3112193 H <br /> m d -1 <br /> 6130193 M <br /> 8131/93 <br /> � N <br /> 12/16193 - <br /> 4129/94- <br /> 9127/94- <br /> 7/27195 - <br /> 11/16195 - <br /> 12/30/96 - <br /> 2/16/934129/949127194712719511/16/9512/30/96 <br /> 8113197 <br /> i <br /> 816/98 <br /> 8/10/99- <br /> 8110100 - <br /> 816/01 <br /> /10/998/10/00816/01 <br />