The good agreement between the DFT/MRCI(2) and ab initio MRCI structural parameters is further mirrored in the comparison of the branching space parameters summarized in Table , but with some caveats. The norms of the branching space directions, g and h, are in good agreement between all methods and levels of theory except for ethylene, which exhibits a slight difference in the norm h. The deviation, however, does give rise to a qualitatively different ConIn region, as both methods furnish an asymmetric double cone. However, there appears to be a consistent difference between the DFT/MRCI(2) and MRCI tilt parameters s x and s y . Specifically, these parameters are consistently smaller for the DFT/MRCI (2) branching spaces in comparison to the ab initio MRCI results for the examples considered here, resulting in former furnishing intersections characterized by vertical non-sloped cones.