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Figure 3.
Spectral analysis of two periods of data acquisition with a metronome set up at 52 oscillations per minutes = 0.8667 Hz, in a continuous experiment. Left: spectrogram from data acquired at 9:00 hr. Right: spectrogram from data acquired at 18:50 hr.
Poirrier et al. Journal of Circadian Rhythms 2006 4:10 doi:10.1186/1740-3391-4-10
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