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Fig. 3. Location of the electrodes. (a) Top view (x,y plane); (b) transverse lateral view (x,z plane). Three lines of four measurement electrodes were used. The first line was located at 5 cm from the bottom (x = 6 cm), the second at 8 cm (x = 0), and the third at 11 cm (x = –6 cm). The electrodes along each line were located at 5, 12, 19, and 26 cm (y coordinate) from the upstream reservoir, respectively. The reference electrode was placed in the upstream reservoir, at z = 8.4 cm.
