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<br />197a <br />DATE CONCENTRATION (ua/m3) DAT_ CONCE:`~RATIO`J (ua/m3) <br />6-ZS-78 30 ~ 11-16-78 11 <br />6-29-78 17 11-20-78 14 <br />7-3-78 27 11-24-78 17 <br />7-7-78 25 11-28-78 16 <br />7-11-78 15 12-2-78 7 <br />7-15-78 13 12-6-78 11 <br />Arithmetic Mean 23.7 <br />Geometric Mean --20.7 <br />,~ <br />~• ~ <br />-i+. <br />