1UU 



90 

 80 

 70 



1 1 1 1 1 1 1 1 1 | 1 



: \ : 



60 

 50 



: \ - 



40 

 30 



20 



\ . " 



\ 



c 



e 



1 10 



-i 9 

 8 



: \ ; 



7 

 G 



5 



: \ : 



4 

 3 



\ '- 



2 

 1 



1 1 ! 1 1 1 1 1 ! |\ 



20 30 40 50 60 70 80 90 100 200 



Assumed Surface Temperature, I (°F> 



Figure 7. Data for Figure 6 plotled on log log coordinates showing extrapolation 

 to very low surface temperatures. 



U 



