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<br />.~. <br />a <br />E <br />0 <br />~. <br />0 <br />N <br />W <br />g <br />U <br />HUMIDITY CELL TESTS <br />Cumulative Sulfate from Samples <br />400 T...._ .. . <br />350 <br />300 <br />250 <br />200 <br />150 <br />100 <br />50 <br /> <br />_ 9 -~---~--~--~ --r- -fi----~-- --i - , _ -~.~ _ .. ~ . ~ . - .y _... ~ . i . - i - - -i--,--~- <br />0 2 4 6 8 10 12 14 16 18 <br />TIME (weeks) <br />^ 79-13 <br />