Piecewise Linear 



T3 



40 



> 50 



O 60 



z 

 o 



70 



< 



o 



^ 80 



O 



a. 



90 



Piecewise Quadratic 



40 T 



60 ■ 



2 3 



RANGE (km) 



Cubic Spline 



Figure 3. Comparison of 1-kHz Propagation Losses for a 40-m Receiver Depth 



100 



