Effects of an object on the dipole tracking accuracy.

A) The three object locations tested are marked in red circles, and our coordinates system is shown. B) The dipole tracking errors for the three object locations and the control (no obj.: no object placed) averaged over all locations visited by fish for 666.7 sec. C) A false color representation of the dipole tracking errors when fish passes by an object. The visually determined traces are shown in grey, and the object is marked as a red circle. D) The error distributions of the dipole tracking near (<20 cm, red) and far (>20 cm, blue) from the object’s surface.