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Spectral analysis A Example spectrogram (left) and spectrum (right) of a single trill call. The fundamental frequency F0 is indicated. Trill calls often have multiple harmonics. The fundamental frequency is the first (and lowest) harmonic. B. Population mean spectrograms of trill calls in the 3 conditions. The solid and dashed horizontal lines indicate the mean and median F0. C. F0 for the ‘self-out’ condition minus the ‘together’ condition for each animal.
