M 



g 0.5 



B 



w 0.2 

 o 



> 



0.05 



0.02 

























FROM ui;filtered data 











1 





















































































































































V 















\ A 



A 













v\ 



























































\/ \ 















" \ 















\ 















V 



~^N 





A 











A/ 



K*S\ 



r*s \ 



s/ 















\y 





30 40 50 

 FREQUENCY. CYCLES PER WEEK 



70 



Figure 10. Spectral density function (variance per unit 

 band) versus frequency. Two significant peaks occur at 

 7 and Ik cycles per week respectively. 



25 



