0.5 



0.4 



0.3 



0.2 



0.1 



0.5 



0.4 



0.3 



0.2 



0.1 



DATA TAKEN IN SHALLOW WATER (So. Calif. 



i i 1 r 



DATA TAKEN IN BERING STRAITS 



-2 -1 



AMPLITUDE 



1 2 



IN STANDARD DEVIATION UNITS 



Figure 3. Exampl es of some PD curves taken in 

 shallow water, compared with a normal curve. 



12 



