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Fig. 1 | BMC Research Notes

Fig. 1

From: Between-year vocal aging in female red deer (Cervus elaphus)

Fig. 1

Measured acoustic variables. a Spectrogram of hind oral (left) and nasal (right) calls. b Mean power spectrum of 0.05 s fragment of a nasal call. Designations: duration—call duration; f0max—the maximum fundamental frequency; f0beg—the fundamental frequency at the onset of a call; f0end—the fundamental frequency at the end of a call; fpeak—the frequency of maximum amplitude within a call; q25, q50 q75—the lower, the medium and the upper quartiles, covering respectively 25, 50 and 75% energy of a call spectrum. The spectrogram was created with Hamming window; 11,025 kHz sampling rate; FFT 1024 points; frame 50%; and overlap 93.75%. Original wav-files are available in Additional file 2

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