The QoH method also allows us to carry out the analysis using the Hückel model of an [8]cumulene where the appropriate C 2 -symmetry has been enforced (see SI). As is clear from Figure , there is good correspondence between the results from the Hückel model and the helical MO of S -1,9-Me- [8]cumulene found using DFT. In the Hückel model, there is again a slight deviation from perfect helicality with a MAD of 3. For the Hückel model, there are only nine sites, one for each carbon atom. This means that we only have nine data points in the graph of Figure whereas the DFT-MOs are evaluated on a near-continuous 3D-grid.