We can also visually inspect the condensed charge density response to the electric fields by computing a difference condensed density, Δ𝒫 , similar in concept to the deformation kinetic energy density in Figure , but now instead of a spherical atomic reference state, the difference is that between the no-electric-field system and those with applied fields, Δ𝒫 667 = 𝒫 667 -𝒫 867 . The offsetting ± signs of Δ𝒫 9 and Δ𝒫 : about the C=C bond path in Figure show graphically why only Δ𝒫 ; achieves a (high) non-zero regional value. Also of note: Δ𝒫 9 shows a preference for accumulation on the +𝑥 (left) side of the sphere; Δ𝒫 ; is primarily positive for C2, and negative regions are primarily in the C-H maximum basins, while the opposite applies to C1; and Δ𝒫 : shows that charge shifted opposite the field direction.