The contribution of the four faces of the multifaceted dividing surface when using two pivot points follows a trend based on steric and electronic effects. The four faces are termed "front-to-front", "front-to-back" (equivalent to "back-to-front"), and "back-to-back". Here, given the non-planar C 3v symmetry of CF 3 , the "front" side refers to the face defined by the pivot point located on the side of the radical opposite the fluorines, and the "back" side refers to the face defined by the pivot point located on the same side as the fluorines.