INTER-PERIODIC CORRELATION. 



253 



60 



40 



20 



GO' 



20 



40 



k PER 101 28 JO 35 



o 



t-H 

 P 



+ 40 



-PER/OH 49 70 SS 



+20 



00 



-20 



1 



PfRlOU 70 TO 77 



00 



--20 , 



ft: 

 I 



STAGE 





7 14 21 28 35 42 49 56 63 70 77 



