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Fig. 7. Positions and amplitudes of the bimodal electric image's characteristic
points (`xR', `x0' and `xC') for different
rostro-caudal object locations (box model; optimal uniform skin conductivity;
object centered 3 cm away from the fish's midline). (A,C) Normalized peak
positions for sinusoidal (A) and skewed (C) current densities. Peak positions
and object locations are normalized with respect to EO coordinates, with the
rostral side corresponding to zero. Blue and green traces are the positions of
the rostral and caudal peaks, respectively, while red traces show the
positions of the zero-crossings. The solid black curve shows the identity
line, where the location of the electric image's dominant peak at the skin
corresponds exactly to the rostro-caudal location of the object. Black broken
lines delimit zones in which certain characteristic curves are closest to the
solid black trace: e.g. in C, the blue trace (xR) is closest to the
identity line in the rostral zone, i.e. the bimodal image's rostral peak is
closest to the object's actual location in this zone. (B,D) Absolute
potentials of the bimodal electric image's rostral and caudal peaks for
sinusoidal (B) and skewed (D) current densities. Blue traces show absolute
potential values for the rostral peak while caudal peak values are shown in
green.
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