Fig. 2. Example of the LEOD measurements obtained from a single fish. All data shown are averages of 15 consecutive measurements. The position relative to the length of the fish is given in the topmost row; the LEOD components (z and y) are shown in the second row. The field vector trajectory of the z and y LEOD is depicted in blue in the third row. At the 50% position, the direction of rotation of the vector loop is shown as an example. Note that the LEODs at the nasal region and the Schnauzenorgan (SO) are highly in phase, which can also be seen in the individual field components of the z and y data shown in black and orange in the second row. The fourth row shows the field module of all three LEODs. In the bottom row, the field vector calculated at the peak of the field module is shown, i.e. the vectors represent the effective stimulus strength and direction. Here, black arrows indicate the vectors as determined relative to the x, y and z plane. Orange arrows are identical to the black vectors, except that their angle is given with respect to the sensory surface of the fish. The drawing of the fish is aligned to match the relative body positions where measurements were taken. Note that the electric organ is situated in the caudal peduncle before the tail fin. Each dot in the drawing indicates the location of an individual mormyromast, showing that the density is highest at the Schnauzenorgan.