For the 𝑥 field, charge density is "pushed" from H1 to H4 and from H2 to H3, leaving the C atoms unchanged, which makes sense as the C-H bonds are identical, so an equal and opposite response is not surprising. We see that each C atom donated and accepted the same amount of density from and to its bound H atoms, essentially leaving the C atoms unchanged by the field. The 𝑦 field results pose something of an interpretative dilemma. One interpretation is that charge flows from H2 to H1, from H3 to H4, and from C1 to C2, all by nearly equal amounts. Alternatively, the charge flow could be pictured as occurring between CH2 groups; from the H2-C1-H3 group to the H1-C2-H4 group. But when the interactions between bonded atoms are considered, the picture is less clear; C1 loses 0.044 net electrons but gains 0.047 electrons from each hydrogen. To see how the charge density response to an electric field is distributed among C-H bonds and the C=C bond, we turn to analysis of interatomic bonding regions.