Eigenfunction (, perturbed pressure over the equilibrium density) in the meridional plane for the three modes located at resonance in Fig. 3: dipolar zonal modes computed with the ACOR code for model 1z, for a uniform rotation frequency of 21 μHz. Left panel: first resonance, for the mode n = −33, middle panel: for the mode n = −73, and right panel: for the mode n = −133. The black solid line corresponds to the critical co-latitude θ_c = arccos(ω_co/2Ω), geometrical feature found in pure inertial modes as defined in Sect. 2.1.