517471.fig.008a
(a)
517471.fig.008b
(b)
517471.fig.008c
(c)
Figure 8: Square root of the autospectral density of faligned versus frequency (a); square root of the autospectral density of ucentral versus frequency (b); coherence between faligned and ucentral versus frequency (c); for a 4.2 m/s fluid velocity.