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<br />10 <br />9 <br />8 <br />7 <br />6 <br />Q 5 <br />4 <br />~3 <br />,- <br />L <br />1 <br />C <br />NCIG, lNC. <br />OW-8: pH <br />Figure. 3,3-1.9 <br />82 84 86 88 90 <br />TIME (YEARS) <br />92 <br />94 <br />96 <br />