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Fig. 3. Representative spectra of frequency sweeps recorded from two subjects
(colored lines, 358 and 430) and spectra obtained after placing a silastic
plug into the glottis and closing the beak (0 mm, black lines). Spectra are
referenced to peak amplitude (110 kHz). Spectra obtained for subjects
390 and BB under these same conditions are similar (see Figs
4,
5,
6,
7).