Left panel: JWST/MIRI photometry eclipse depth measurement at 15 µm (black data point) in context with different atmospheric models (solid coloured lines), and airless blackbody (BB) models for different Bond albedos (A_B; dashed and dotted brown lines). We note that T_day is the corresponding dayside brightness temperature as computed with Equation (2). All atmospheric scenarios are computed with A_B = 0.1 and using the ‘f-approximation formula’ based on Koll (2022). N₂ and O₂ are both spectrally inactive (no significant absorption features) at these wavelengths, thus yielding nearly identical thermal emission spectra. Only the N₂/CO₂ scenarios are plotted for simplicity. The result from the Eureka! reduction is also shown (orange data point). Right panel: atmospheric models (coloured circles) and atmosphere-less models (squares) from the left panel averaged over the F1500W bandpass. The grey shaded region represents the lower and upper error on the photometric measurement (solid line) obtained through a simple mean of both pipeline results.