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I <br /> A 72 Project Period <br /> N departure of zinc concentration <br /> 3 <br /> � 2 <br /> a <br /> � 1 <br /> a� <br /> 0 <br /> IBM <br /> 0 <br /> Z -1 <br /> -2 - <br /> 1 2 3 4 5 6 7 8 9 10 11 12 <br /> Period <br />