In the discussion of 1 we will now ignore the σ-system and only focus on the contribution from the π-system to the current density. We showed in Figure (see the gradients of the MOs, F(x, y, z)) that the gradient across a nodal plane is substantial. However, considering that ∇ψ is not necessarily multiplied with a ψ exhibiting a node in the same place, we ask the following question: Why is it that only the nodal plane in the plane of 1 is visible in the current density and not the other nodes of the MOs? For instance, why are the nodes in the HOMO and the HOMO-1 between the bonds not apparent?