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Fig. 4. Calling song analysis. (A) Oscillogram of a single P. pallicornis song; scale bar, 10 ms. (B) Detail of waveform shown in A; scale bar, 0.5 ms. (C) Power spectrum of the song in shown in A. (D) Spectrograms of two different specimens (note inter-individual variation of call). While the overall spectrum (C) is noisy, spectrograms (D) reveal a segment in the middle of the call with clearer tonality and harmonic structure.





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