Additionally, from the computed g and h norms as well as the large overlap between the DFT/MRCI(2) and MR-CIS branching spaces, we can exclude differences in the branching vectors as the reason for the difference in the tilt parameters. That is, the norms of x and y in Eq. 14 is not the dominant term that results in smaller values of s x and s y for DFT/MRCI(2) compared to MR-CIS. The significantly smaller value of σ 2 for DFT/MRCI(2) is thus found to be responsible for giving rise to smaller values of s x and s y .