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Figure 6


Fig. 6. Echogram during the start of a buzz showing the hand-off from regular clicks (those before click `0') and buzz clicks. Each vertical slice of the echogram contains the outgoing click (at TWTT 0) and the subsequent echo returns. Pixel darkness indicates amplitude (the darker the pixel the greater the amplitude). Of the three echo sequences apparent before the buzz, only one continues to be visible during the buzz. The hand-off distance for this target was 3.0 m using a nominal sound speed in seawater of 1500 m s-1.





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