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(a): Photograph of recording tip; the electrodes are labelled 1–4 and an arrow points to a reference marker denoting the position of electrode 1; (b): Shaft design: (i) 4 mm Teflon sleeve; (ii) stainless steel shield; (iii) heat shrink tube; (iv) 0.3 mm Teflon-coated silver wires. The sleeve was filled with epoxy resin.
