40 deg ^ A0„ < 42 deg 

 Cases n = 6 f. = 0.103 Hz 



120 90 60 30 



(deg) 



-30 -60 -90 -120 



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



b. Contributing curves 



Figure 30. Composite directional distribution for a 

 case with intermediate spread 



99 



