Fig. 6
a The sensitivity field of the four-electrode system and b the normalized sensitivity at different positions on right half of the four-electrode setup (x 0 ≥ 0 µm) (the left side would be a mirror image of b) as the average over the cell volume at corresponding locations. Observe that here the sensitivity color scale is between −1 and 1 as with a four electrode setup both positive and negative values of S can occur