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Fig. 2. Position and width of the low-frequency band of the calls of five Neoconocephalus species at -3 dB (thick bar) and -10 dB (thin bar): N. nebrascensis (N=10), N. bivocatus (N=8), N. robustus (N=10), N. retusus (N=9) and N. ensiger (N=3). The position of the mean peak frequency is indicated by a vertical line.