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HUMIDITY CELL TESTS <br />Cumulative Sulfate from Samples <br />18 <br />16 <br />14 <br />12 <br />10 <br />^ 4~TR96 <br />B <br />6 <br />4 <br />2 <br />0 <br />20 22 24 26 20 3B <br />TIME (weeks) <br />