<div><p>The black bars show the zero equipotential surfaces as in <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.0010016#pcbi-0010016-g001" target="_blank">Figure 1</a>.</p><p>(A) Basal field (in the absence of objects). (B) Perturbing field produced by the same scene as in <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.0010016#pcbi-0010016-g001" target="_blank">Figure 1</a>B.</p><p>(C) Electric image of the metal object depicted in a colour map on the modelled transparent fish from a <i>scorci</i> view.</p><p>(D) Electric image along the intersection of the skin with the sagittal plane.</p></div