Iron atmospheric model spectrum as a function of wavelength including contributions given by the hydride as a source of continuum absorption. In blue the atmospheric model for Fe, with no absorber added. In orange, the template spectrum including H⁻ free-free as source of continuum opacity, boosted by a factor of 10. In red, the spectrum including a solar amount of H⁻ bound-free. In the green and purple spectra, the bound-free contribution is boosted by a factor of 10 and 1000, respectively. The purple spectrum includes contributions by H₂O beyond 1.6 μm. The grey and cyan coloured regions indicate HARPS and NIRPS coverage, respectively. It is worth mentioning that HARPS and NIRPS cover a similar fractional bandpass. We intentionally boost the continuum level differentiating the two main contributions to illustrate how the Fe spectrum changes accordingly.