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Acoustic analyses of the male calling song structure of S. yangi from Hancheng (HC). a oscillogram and spectrogram of the timbal and stridulatory sounds shown alternately (i.e., upward and downward echemes). b detailed oscillogram and spectrogram of timbal and stridulatory sounds (marked by the red box in a). c, d power frequency spectrum with overlay of 174 spectra computed in the middle of the signal showing dominant frequencies marked by F1
