In Figure , the heatmap color indicates the vector component of the electric field in the cartesian "y" direction, with red-yellow-green shades indicating a component in the + ydirection (upward) and blue shades indicating a component in the -y direction (downward). As the pair of arrays approach one another, net repulsion transitions to net attraction. At 4.0 cm, repulsive forces clearly predominate, but through 3.5 cm and 2.7 cm, repulsive and attractive forces begin to interdigitate. Within 1.4 cm (the distance between the pair of electrostatic arrays at the height of the potential The results illustrated in Fig. (b) and Fig. parallel the magnetic "Coulomb" barrier findings. The potential curves are nearly identical, and the observable behavior of the magnet arrays is illustrated analogously in the electrostatic heat maps. Both reveal that the force between the respective arrays (attractive or repulsive) depends on the degree of separation. And both demonstrate strong attraction within the potential barrier that emulates the behavior of the strong nuclear force within the Coulomb barrier.