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Observation and spectral analysis of a metronome at 200 oscillations per minute. A: observations from the first software module. B: mean power of observed frequencies; 3.35 Hz is the frequency that has the maximum mean power (200 opm = 3.333 Hz). C: spectrogram of observed frequencies over time (intensity scale on the right) (opm = oscillations per minute). D: correlation plot between theoretical and observed frequencies of a metronome (n = 24)
