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Control of the oscillation period and phase durations in the 2-phase rhythm-generating state. Changes of the oscillation period (T) and the durations of inspiration (TI) and expiration (TE) in the medullary model were produced by the changes in total (dimensionless) drives to pre-I neuron (D1, A), early-I neuron (D2, B), and aug-E neuron (D4, C).
