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NGSW <br />2000 <br />1500 <br />m 1000 <br />9 <br />1 500 <br />0 <br />O Sulfate <br />01/89 01/90 01/9 1 01/92 01/93 <br />01/94 01/95 01/96 01/97 <br />Date <br />