Going back to the EDC, which is the main focus of this manuscript, we will propose a simple method for directly visualizing EDC (without using wavefunction tiles) during a chemical reaction, which will complement the aforementioned analysis tools. The key step for our EDC visualization, as outlined in Section II, is to map a rectangular grid for the first stationary structure (such as reactant) onto the space of the second stationary structure (such as transition state). Through evaluating the electron density on the distorted grid for the second structure, we can assess/visualize the changes to the electron density on the original rectangular grid for the first structure. Such EDCs will be shown in Section IV for several model reactions, which conform well with our chemical intuition.