VTTKM VTIOIN DIAGRAMS 1'OK SURFACE DUCTS 



241 



100 



u10 



a 



10 



100 

 DUCT THICKNESS IN FEET 



1000 



Figure 2. Horizontal attenuation of first mode and trapping index, 10,000 mc, standard attenuation ( M deficit) : 

 1.83 db per 1,000 yd. 



