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. 2013 Apr 8;8(4):e60752. doi: 10.1371/journal.pone.0060752

Figure 2. Echolocation behavior and flight speed of a P. pipistrellus flying towards the microphone array.

Figure 2

The parameters pulse duration (DUR), pulse interval (PI), flight speed (V), max. signal SPL measured at the upper right microphone of the array (amplitude in dB relative to full scale), and source level (SL in dB SPL re 20 µPa at 1 m) of one typical flight plotted over distance to the array. In the lowest graph, real source levels (SL) of signals within the array are marked by circled points, all other values indicate apparent source levels (ASL). The dashed line indicates the beginning of the approach.