NUMBER OF OBSERVATIONS 



8 



7 - 

 6 - 

 5 - 

 4 

 3 

 2 







ISTDOEV. 



r.\ 





t • • 



,V. 



1 



MEAN = .056 ISTDDEV. 



1U4 



1 



UL 



.005 .015 .025 .035 .045 .055 .065 .075 .085 .095 .105 .115 



RATIO 



Figure 12. Ratio of drift speed to wind speed. 



.130 



21 



