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Spectrograms of two distance calls from the same male zebra finch before and after denervation of the syringeal muscles. Time waveform and spectrogram (top two panels), subsyringeal air sac pressure patterns from ten calls (third panel) and Hall effect signal reflecting the OEC expansion patterns during ten calls (fourth panel). These traces indicate that air sac pressure and OEC patterns of DC did not change after the denervation of the syringeal muscles; units as in figure 4.
