This figure shows a slice through the magnetic field given in terms of the Zeeman shift in mK units. The nearly rectangular nature of the contours highlight the nearly separable nature of the potential energy (i.e. with a form V1(z) + V2(r)) experienced by the antihydrogen atoms at low energy. Here the potential energy experienced by an antihydrogen atom due to the spatially varying magnetic field with every contour representing a change in energy of 10 mK × kB.
Image Credit: Institute of Physics.
Click image for the largest view.