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Fig. 1. Breakthrough curves for SF6 (sulfur hexafluoride; nonpartitioning tracer) and trichlorofluoromethane (CFM) or difluoromethane (DFM) (partitioning tracer) obtained from (A) Exp. 1, (B) Exp. 2, (C) Exp. 3, (D) Exp. 4, (E) Exp. 5.