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Nuclei annotation methods. The nuclei of each syllable (denoted by the corresponding syllable number 1,2,3,…) were annotated using acoustic information and visual information from the sound wave (top), the spectrogram (bottom, Fourier's window length equals 0.05 s), and the signal intensity (yellow curve). Distances between adjacent nuclei are denoted by ds and is are the corresponding differences between intensities of adjacent nuclei.
