Signal-to-noise ratio K_p – V_rest maps for the probed chemical species: H₂O, CH₄, NH₃, C₂H₂, HCN, CO, CO₂, and H₂S. Each K_p – V_rest map shows the S/N of the cross-correlation of the GIANO-B spectra (4 transits combined) with isothermal atmospheric models, as a function of the planet’s RV semi-amplitude (K_p) and the planet’s rest-frame velocity (V_rest). The S/N is computed by dividing the peak value of the cross-correlation function at each K_p by the standard deviation of the noise far from the peak, as described in the text. Negative S/N values correspond to anti-correlation. The vertical and horizontal white dashed lines correspond to V_rest = 0 km s⁻¹ and the expected K_p value (${\hat{K}}_{\mathrm{p}}$), respectively.