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Gain spectrum of the active-channel amplifier. The system’s gain, defined as the ratio of the response’s amplitude to that of the linear passive system, is greatest for stimuli near threshold. With growth of the stimulus amplitude, which is indicated for each trace, the frequency selectivity declines and the system approaches linearity. Peak response amplitudes range from 0.37 nm for 0.2-pN stimulation to 3.4 nm for a 40-pN input.
