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Fig. 11. (A) Second harmonics (2f0) in Florida `tow-hee' calls have relatively low amplitudes. These results suggest that harmonics with frequencies above ~4 kHz may be strongly attenuated. Illustrated are the mean relative amplitudes (thick lines) of harmonics in calls produced by 36 Florida subjects (N=1067). Thin lines represent the addition or subtraction of one standard deviation. (B) Representative time-frequency spectrograms of two Florida tow-hee calls, measurements of beak gape obtained from video recordings, and amplitude traces for each call.





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