WLIS 

 AUGUST 1986 



12 3 4 5 

 MEAN RPD DEPTH (CM) 



264- 



F 15+ 

 R 



16-- 



5-- 



ULIS REF 

 AUGUST 1986 



N = 28 



MEAN RPD DEPTH (CM) 



Figure 3-12 • Frequency distributions of mean RPD depths 

 at WLIS and WLIS reference. 



