Thick atmosphere case (10 bar, N₂ atmosphere with 20% of CH₄ and 0.2% of C₂H₄). Upper panels: synthetic observables and observed data (eclipse depth vs wavelength, left, and phase curve, right). Lower panels: temperature profile (left) and map (right). The temperature map corresponds to a sum of the atmospheric layers, weighted by their contribution to the emission at 15 µm. We added the similarly weighted wind vectors as black arrows. The shadowed area in the right panel corresponds to the layers contributing to 95% of the emission. The difference between the 1D and 3D temperature profiles is discussed in Appendix B.3.