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Example of a heart rate density distribution from subject 1 under the −3% stimulation condition at an n of 2.0. The stimulus BPM was computed on the basis of the mean HR calculated over the previous 5 min. Orange line: position of the stimulus BPM. Shaded green: area of the densities between stimulus BPM ± n BPM, n = 0.5, 1.0, and 2.0 BPM.
