Retrieved best-fit pressure-temperature profiles when using GRAVITY (light blue) and all datasets except CRIRES₊ (dark blue) for Exo-REM forward modeling. Shaded regions represent the 1 and 2 σ confidence interval, respectively. They are compared with the cloud optical depths of Mg₂SiO₄ (dashed brown) and Fe (dashed gray) defined as dτ = σ_c n dz with σ_c the effective extinction cross-section of the cloud (in m²), n its concentration (in particles/m³) and dz the thickness of the atmospheric layer (in m). The red curve represents the photosphere (region from which most thermal emission originates). In practice, we used a similar approach as Charnay et al. (2018) and constrained the pressure–temperature between the minimum and maximum of the brightness temperature computed between 0.625 to 10 µm.