Figure 11


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Power spectral densities of the fluctuations of axial velocity uz at r = r0 between z = 0 and L for (a) L = 15r0, (b) L = 20r0, (c) L = 25r0 and (d) L = 30r0. The color scale is the same in the three cases and spreads over 3 dB, from white to black. The black dashed lines indicate the frequencies St = 0.04, 0.09 and 0.22.

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