To gauge the uncertainty arising from the choice of potential correction term, a simple test was performed. VRC-TST rate coefficients were evaluated with each correction term, and also with no correction term, using a single dividing surface defined by two pivot points on each CF 3 fragment. The pivot points were located approximately 0.5 Å from each face of the radical site along the C 3v axis of the CF 3 . The point-to-point separation distance was set at approximately 3.5 Å. This corresponds to the optimal canonical transition-state dividing surface between approximately 600-800 K. The results of this calculation are shown in Figure , and the trend of the magnitudes of the rate coefficients in the optimal region are in the reverse order of the trend seen in the potentials from Figure .