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A-72 Project Period <br /> N departure of zinc concentration <br /> 4 <br /> 3 <br /> 2 <br /> ,v_ <br /> Z <br /> 1 <br /> N_ <br /> U <br /> E <br /> L <br /> 0 <br /> Z -1 <br /> -2 <br /> -3 <br /> 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 <br /> Period ( 1= June 1996) <br />