Figure 3:

The modulus of the electric field ||E|| corresponding to the basis mode combination that results in the current patterns shown in Figure 2 (central voxel). Either with or without a layer of HPM, ||E|| and sample noise are identical for the ideal current patterns and the signal-only optimal current patterns, while the ||E|| corresponding to the dark mode current patterns is vanishingly small. The sample noise, calculated as the sample conductivity times the integral of ||E||² over the volume of the dielectric sphere, was normalized by the value obtained or the ideal current pattern case without HPM.