The unusual force units of GeV/fm refer to the energy scale, a more meaningful expression of force at the quantum level. The length units in 3(a) and 3(c) do not correspond (cm versus fm), but regardless of length or force units, the salient point is that the general morphology of both force/distance curves indicates a confinement force. This force is least at small separations and (initially) increases in a roughly linear fashion with increasing separation. In the Musulmanbekov graph, the increasing strong force between a displaced quark with increasing distance results in its confinement within the nucleus. (It is important to point out that individual quarks have never been isolated, and the work required to displace a quark beyond a certain distance from the nucleus results in the formation of a quark/antiquark pair). In the case of the magnetic "Coulomb" barrier, the force/distance behavior of a pair of approaching magnetic arrays parallels the behavior of a pair of identically configured theoretical electrostatic arrays. The student may elect to confirm that the force/distance curve resulting from the displacement of a single charge from a regular sequence of alternating/unequal charges, as shown in Figure (a), may be emulated experimentally by the application of an orthogonal force to a linear sequence of equally-spaced, coupled magnets.