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Fig. 4. Phase plots of the responses of 15 primary afferent (PA) fibers (A) and 15 dorsal octavolateral nucleus (DON) units (B) during stimulation with a small dipole field moved slowly along the rostro-caudal axis of the rostrum. Traces are sorted by the location of the receptive field. Stimulus frequency was 2 Hz and the speed 0.5 cm s-1. Stimulus electrodes were oriented perpendicular to movement direction.