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r-- i ---- <br /> A-72 Project Period <br /> N departure of zinc concentration <br /> 4 - - --- — — — ---- <br /> 3 <br /> � 2 - <br /> .N <br /> � 1 <br /> C° 0 — — — <br /> O <br /> Z -1 <br /> -2 <br /> 1 2 3 4 5 6 7 8 9 10 11 12 <br /> Period <br />