a, Spatial profiles of spike waveforms of all 21 neurons recorded across 32 channels in three recording sessions marked by three different colors. Many neurons exhibit stable waveforms that are most prominent in adjacent channels.
b, Spike waveforms of all 21 neurons from the channel with the largest amplitude recorded in 3 sessions. Different colors indicate different recording sessions, as in a. The waveforms of the same neuron recorded at different sessions are highly similar.