PRESSURE GRADIENT 1 



PRESSURE GRADIENT 2 



PRESSURE GRADIENT 3 



MBS 



101 



PRESSURE GRADIENT 4 



-NORMAL 



" 5 J 



15 



F 

 15 



•1977 



M 

 15 



A 



15 



M 

 15 



J 

 15 



J 

 15 



A 

 15 



S 

 15 



Figure 21.— PRESSURE GRADIENTS 1-4. 

 37 



