lO i I I I I 



1 — I — I — I — I — I — I — I — I — I — I — r 



I I I I I I I I I I I I I I I I I 



1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 



LAG 



Figure 7. Autocorrelation functions of X (-A~) and X' (-0-) 



functions go to zero between lags 2 and Z. 



Both 



29 



