JEB -- Nelson et al. 208 (2): 297 Figure IG3

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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 (1–10 kHz). Spectra obtained for subjects 390 and BB under these same conditions are similar (see Figs 4, 5, 6, 7).