FIGURE 



SECTION 





B-1 



A-1 



SHALLOW 



B-2 



A-2 



DEEP 



B-3 



B-1 



SHALLOW 



B-4 



B-2 



DEEP 



B-5 



C-1 



SHALLOW 



B-6 



C-2 



DEEP 



50 60 70 



39 



