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Slowing (i.e. increase in latency, expressed as percentage of control) measured at 1 and 3 min after start of repetitive stimulation, showing increasing separation of three types of unit with increasing frequency: type 1 (•), type 2 (▴) and type 3 (▪). 1 at 1 min indicates that the unit fails before 3 min. Symbols connected by lines denote same unit.
