517471.fig.009a
(a)
517471.fig.009b
(b)
517471.fig.009c
(c)
Figure 9: Transfer function Hcentral(ω); modulus versus frequency (a), phase versus frequency (b); coherence between fcentral and ucentral versus frequency (c); in-air, in still water, and for 3.4 m/s and 4.9 m/s fluid velocities.