Final continuum-removed, wavelength-calibrated ERIS/SPIFFIER spectra delivered by our pipeline for each of the companions observed within our survey. The spectra of each target are shown over two lines (upper and lower panels) for better readability. The typical (i.e. median) uncertainties of our measurements are indicated as an error bar on the left side of each spectrum. We show three spectral templates as reference for the features visible in the data (black), namely a telluric, H₂O, and CO template. For instance, the CO lines between 2.294 μm and 2.34 μm are clearly recognisable in all spectra, whilst the H₂O lines, which are distributed everywhere, are harder to identify. Due to the correction of the telluric absorption lines, some artefacts of the outlier imputation are visible at longer wavelength (in particular at 2.436 μm and 2.452 μm). We note that the spectra were transformed to the rest frame of the companions to align the spectral signatures present in the spectra, as otherwise the peculiar RVs of each companion would render this plot harder to read.