rn 



X^A^ 



400 



600 



800 



Figure 1 Model of a random sei of ice keels, with incoming and 

 scattered rays suggested by the arrows. 



for 'ando"! o"««iatw 

 Mu .''SXv »«i- BvM - rV *" 

 <*ti«re i s -»n<Jom <JI <1 



Figure 2 Cross section of a keel model The equation gives the 

 widening factor caused by oblique incidence on a randomly 

 oriented keel 



