Top panel: power spectra of the fluctuating velocity from four horizontal planes as indicated in the legend in Run C1v. The horizontal wavenumber is made non-dimensional by multiplying with the density scale height H_ρ at the same depth. The dashed line shows the slope for Kolmogorov k^{− 5/3} scaling. The inset shows a comparison of power spectra of the full velocity field (dashed lines) and the fluctuating velocity from which the temporal average is removed (solid lines) from depths 6 Mm (blue) and 18 Mm (black). Bottom panel: wavenumbers corresponding to Taylor microscale (black solid line; see Eq. (16)), and the peaks of the fluctuating velocity power spectra (red dashed) and the fluctuating vertical velocity (blue dash-dotted) spectra as functions of depth and normalized by H_ρ.