In Fig. 80 the result (4.9) has been plotted (solid curve) for the parameters of the experiment by Fontein et al. (ξ/W = 0.85 × 10−5 for N = 4, B = 5T, and W = 2mm). The agreement with experiment is quite satisfactory in view of the fact that the theory contains no adjustable parameters. The theoretical profile is steeper at the edges than in the experiment, which may be due to the limited experimental resolution of 70 μm. The total voltage drop between the two edges in the calculation (hI/Ne2 ≈ 32mV for I = 5 μA and N = 4) agrees with the measured Hall voltage of ≈ 30mV, but the optically determined value of 40mV is somewhat larger for a reason that we do not understand.