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Overhead view of experimental setup showing distracter distances and angular offsets (not to scale). Inset diagrams show a call (C), distracter echo (D), and target echo (T) when the target is behind or in front of the distracters at two example distracter positions. When calls are short (top), no overlap of echoes occurs, whereas distracter and target echoes do overlap when the call is long (bottom).
