Power spectrum of the latitudinal velocity, u_y, as a function of frequency (horizontal axis) and latitude (vertical axis). Each panel corresponds to a different azimuthal order: m = 3 (top), m = 5 (middle), and m = 10 (bottom). The turbulent Reynolds number is set to Re_turb = 300. The solid black curve shows the critical latitudes, where the differential rotation exactly matches the phase velocity of the inertial waves, and is defined by the implicit relation Eq. (61). The dashed vertical lines show the real part of the eigenfrequencies of the homogeneous problem, with the same colour code as in Fig. 6.