as their magnitudes are sensitive to the singlet-triplet energetic gaps. These gaps in turn strongly depend on the amount of the exact exchange included in the XC functional that is reflected in the values of SOC elements. The energy-weighted values also vary in quite wide ranges and experience a singularity at the (0.15, 0.10) point since a near exact degeneracy of states is accidentally met. Thus, one can expect the separation parameters to play an important role for theoretical studies of photodynamics if intersystem crossing events are of interest.