Fig. 7. Attenuation of pure-tone sound pulses (7-40 kHz) over distance, as measured in a typical biotope of the five Neoconocephalus species. The curve fittings (solid lines) were calculated using the formula y=a^*x+b^*log(x)+c. The dotted line indicates the theoretical attenuation due to spherical spreading alone (6 dB per double distance).