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<br />AMW1 <br />pH <br />8.4 <br />8.2 <br />8 <br />7.8 <br />7.6 <br />7.4 ` <br />7.2 <br />7 <br />0 5 10 15 20 25 <br />Quarters, 1990 - 1995 <br /> <br />