Mean residuals between the observed and modeled normalized fluxes taken for 7324 RVS spectra in the validation set at each wavelength pixel in the DIB window as a function of the spectral wavelength for different parameter pairs of n_estimators (NE) and max_depth (MD) in the RF model (scikit-learn). The error bar represents the standard deviation of the residuals of individual spectra at each wavelength pixel. The mean value (Δ) and standard deviation (σ) for all the pixels are marked in each panel. All the values are enlarged by a factor of 10⁴.