Variations of the impact radius ρ on the detector plane with the outgoing angle of the electron at different scaled energies. The detector is located at z = −0.5 plane. The scaled electric field gradient is α = 3.0. The scaled energies are (a)ε = 0; (b) ε = −0.2; (c) ε = −0.4; (d) ε = −0.6; (e) ε = −0.7; (f) ε = −0.74 respectively.