Imaginary part of density fluctuations in the case treated in Fig. 6 for a lower boundary located at the pressure level p₀ = 10⁴ bar instead of the centre of the planet as in Fig. 6. The density fluctuations are plotted as a function of latitude (degrees, horizontal axis) and pressure in logarithmic scale (bars, vertical axis) in the case with rotation and radiative cooling and for two different tidal periods, (i) τ_tide = 0.1 day (left) and (ii) τ_tide = 10 day (right). The corresponding rotation rates are given by Ω = σ∕2 + n_orb with and n_orb = 2π∕τ_orb (see Table 1).