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A-72 Project Period <br /> N departure of zinc concentration <br /> 4 — <br /> 3 <br /> 2 <br /> v <br /> � 1 <br /> v <br /> a� <br /> _N <br /> m 0 <br /> Now <br /> L <br /> O <br /> Z -1 <br /> -2 <br /> -3 <br /> 1 2 3 4 5 6 7 8 9 10 11 12 <br /> Period <br />