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�k-72- Project Period <br /> N departure of zinc concentration <br /> 4 <br /> 3 <br /> i <br /> Ma 2 <br /> Dec96 Mar99 <br /> U 1 Dec97 <br /> -� c9 <br /> n9 Mar00 <br /> 97 Ma c <br /> mom <br /> N_ <br /> ca 0 <br /> E <br /> Z Jun Sep96 97 Se <br /> -1 p Jun98 Sep98 Jun Sep99 <br /> -2 <br /> -3 i <br /> Period <br /> B-17 <br />