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Echolocation beam shape depends on frequency. The directionality is shown as beam patterns at frequencies of (a) 45 kHz, (b) 50 kHz, (c) 55 kHz, (d) 60 kHz (e) 65 kHz, (f) 70 kHz and (g) 75 kHz. The mirror images of the values around 0° were added to create symmetrical plots. Standard deviations are shown as dashed curves. All plots illustrate how sound pressure decreases as off-axis angle increases. The plots also show how directionality increases with frequency.
