Comparison between the 2023-11-23 data after subtraction of the stellar contribution and the best fit Exo-REM/Exo_k model in a segment of order dominated by CH₄ absorption lines. The top panel shows the raw data subtracted by the estimated stellar contribution at the full spectral resolution, while in the bottom panel, the data has been smoothed to a spectral resolution of ∼30 000 that takes into account the decrease of resolution induced by v sin i.