Additionally, we want to assess the influence of the different electronic structure methods on the geometrical evolution of the molecule. In particular, it is interesting to see in which regions of configuration space initially the coupling between electronic states becomes large, driving the deactivation of the molecule. Therefore, Figure shows the C=CH 2 bond length elongation and HCCC torsion angle at which the first spawn occurs in each IC. We note that we plot all first spawns, in the CASPT2 dynamics including those that occur after 43 fs. It has to be noted that the coordinates indicated for the optimized CoIns are obtained at the CASSCF level and as shown in Fig. these do not correspond to CoIns at any CASPT2 level. As discussed in Ref, the dynamics are initialized with zero momentum for each initial condition, which is expected to initially lead to rather a stretching of the C=CH 2 bond than the torsion of the CH 2 group. This is reflected in the spawning geometries that overall do not show very large dihedral angles. A general trend can be observed that more spawns occur with all CASPT2 flavors at higher C=CH 2 stretches and also at larger torsion angles. In particular, all CASSCF spawns happen and bond lengths between 1.5 and 1.6Å, while in all CASPT2 dynamics spawns occur outside this range, at smaller as well as longer bond lengths. Curiously, despite only a small fraction of trajectories showing a reflective behavior a majority seems to spawn in the vicinity of the sloped CoIn. This leads to the assumption that while the minimum point of the seam of CoIn dominated by the C=CH 2 bond elongation shows a strongly sloped topology, the same cannot be said for other CoIns along this seam.