20 deg S Ad^ < 22 deg 

 29 Cases n = 1 f^ = 0.054 Hz 



1 — I — ' — r 



a. Mean (solid line) plus and minus one standard deviaiion (dashed lines) 



120 90 60 30 



30 -60 -90 -120 



e (deg) 



b. Contributing curves 



Figure 29. Composite directional distribution for a 

 case with narrow spread 



98 



