Test of the impact of the S/N in each of the selected range of the spectrum performed on the primordial atmosphere of the hot Jupiter around an 8th magnitude G star. In green, we show the retrieval performed considering an error of about 5 × 10⁻⁵. In orange, the retrieval obtained with an error of about 1 × 10⁻⁴. Yellow band highlights the values retrieved in the original case (δ ≃ 3 × 10⁻⁵). Magenta and cyan boxes represent the distributions of the values obtained by performing the retrieval without the first point or without the entire section 1 of Fig. 6, respectively. Blue line highlights the true value.