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Phenomenological three-dimensional model of the bat sonar beam. In this model the sonar beam consists of two equal sized lobes, directed ζ degrees apart in the dorso-ventral plane. Each isolated, individual lobe is modeled as the beam from a piston source. The drawing of the bat is merely schematic. No inference is made about the relation between the vertical orientation of the bat’s head and the vertical orientation of the hypothesized beam.
