At the final time shown in Fig. , t = 100 fs (right panel), the central portion of the TDPES where the nuclear density is mainly located has, once again, a saddle shape along ϕ with maximum in ϕ = 0, allowing in this way the nuclear density to reach the CIs and to "funnel" to the ground state, thus accessing the trans configuration. However, note that in a description based on the TDPES, we do not need to invoke any funnelling process to justify the transition from the cis to the trans region, which is, in fact, simply accompanied by the shape of the TDPES. The highly oscillatory features that develop in the colored areas of the TDPES arise from the interferences between the S 1 density transferred in S 0 and the S 0 density. After t = 100 fs and up to t = 200 fs, the shape of the TDPES in the trans region is mainly characterized by interferences between the S 1 portion of the density that continuously funnels through the CIs and the S 0 portion that accumulates there.