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Characteristics of the canonical HR: a 1 stands for the peak amplitude of the main response, a 2 is the magnitude of undershoot, t 1 is the time-to-peak, t 2 is the time-to-undershoot, T 1 denotes the activation period, T 2 denotes the deactivation period, m 1 is the mean in T 1, and m 2 is the mean in T 2.
