Fig. 5. Retardation factors for tetrachloroethene (PCE) and 1,1,1-trichloroethane (TCA). The rectangles (first replication) and triangles (second replication) represent measured total retardation factor (R_t) values; solid lines represent predicted total (R_t) and partial (ß) retardation factors; and vertical solid lines represent the standard deviation of predicted R_t values.