Fig. 10.

(a) Band-limited white noise whose effective sampling frequency has been increased to 10 Hz, and (b) the corresponding log–log plot of $F$ as a function of $n$. The exponent can be defined uniquely from $n=20$ to $n=2000$ since we now have a sufficiently high sampling frequency: cf. Fig. 9a where two slopes are needed to obtain a satisfactory fit. The fitted regression is shown by the solid line, and the upper and lower thin lines represent 95% confidence intervals.