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Vertical received angle (°)

Figure 7.5 Ambient-noise vertical directionality for the 10° horizontal sector centered at 15° in Figure 7.4. Rays with positive angles arrive at the receiver from below the horizontal plane. A ray with an angle of -90° arrives from the surface directly over the receiver (Wagstaff, 1973).

Vertical received angle (°)

Figure 7.5 Ambient-noise vertical directionality for the 10° horizontal sector centered at 15° in Figure 7.4. Rays with positive angles arrive at the receiver from below the horizontal plane. A ray with an angle of -90° arrives from the surface directly over the receiver (Wagstaff, 1973).

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