Top: composite microscope image of the diamond plate showing the fabricated graphitic wires. Bottom-left: magnified view of the area shown in the red square marked `A'. The upper electrodes can be seen in focus; the lower electrodes are out of the microscope focus. It can be seen that each electrode comprises three parallel tracks laterally spaced by 2 µm. Bottom-right: magnified view of the area shown in the red square marked `B'. The upwards `vias' are visible in focus.