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Fig. 8. Three-dimensional comparison of the electric images of different objects,
with the modulation caused by the object colour coded. (A) The electric image
of a metal cube. (B) The electric image of a plastic cube. (C) The electric
image of a metal sphere. (D) The electric image of a plastic sphere. Note that
high modulation values are shown in red and low modulation values are shown in
blue. Therefore, the baseline for conductive objects (metal) is shown in blue
and the baseline for non-conductive objects (plastic) in red.