Why might the shape of the current not follow the bonds? In Figure , we show the current density of 2 calculated at two different energies and with a varying amount of filtered MOs. In the top row of Figure , we show the current density calculated at EF with no MOs filtered. In the middle row of Figure , we show the current density calculated at the energy of the HOMO, EHOMO. In the bottom row of Figure , we show the current density calculated at EHOMO where the contributing MOs have been filtered according to Equation . Choosing x = 0.9 is equal to only including two orbital-gradient pairs in the current density calculation: ψHOMO∇ψHOMO-1 and ψHOMO-1∇ψHOMO. To understand what makes the current density curve away from the bonds, we start by reducing the number of orbitalgradient pairs included in the calculation. This reduction is done in two steps: First, we calculate the current density at the energy of the EHOMO. We see from the middle row of Figure that this has a negligible effect on the qualitative shape of the current density. Second, we filter out all but two orbital-gradient pairs: ψHOMO∇ψHOMO-1 and ψHOMO-1∇ψHOMO. Again, there is a negligible effect on the qualitative shape of the current density.