Eclipse spectrum of WASP-12b. Left: observed occultation depths of WASP-12b (gray points) with the CHEOPS and TESS occultation depths are shown as colored diamonds. The best-fit thermal retrieval model and its 1σ uncertainties are overplotted in green while the forward thermal 3D GCM spectrum is plotted in violet. The gray dashed curves show the blackbody model spectra for brightness temperatures of 2600 K, 3000 K, and 3400 K. Right: T–P profile for the retrieval showing a gradual temperature decrease with decreasing pressure depth between 10⁻¹− 10⁻⁴ bar indicative of no thermal inversion in the atmosphere of WASP-12 b. The contribution function at each passband is also shown indicating that TESS and CHEOPS essentially probe the same pressure levels within the atmosphere.