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Fig. 6. Oscillograms and spectrograms of coo vocalizations (A) before esophageal
tube was implanted, (B) after tube implant surgery and with closed tube and
(C) after tube implant surgery and with open tube. The power spectra (bottom
panels) are derived from a 100 ms segment during the second half of the
e2 note, centered on the time indicated by the dotted line in the
spectrogram.