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A, representative waveforms of the three types of C fibre, scaled to same peak-to-peak height. (Top row: type 1; middle row: type 2; bottom row: type 3.) B, waveforms as in A, plotted to same scale. C, means ±s.d. of measured amplitudes of 18 type 1 (top row), 10 type 2 (middle row) and 6 type 3 (bottom row) units, plotted at mean measured separations. Scale bars at bottom right apply to all traces in B and C.
