Refractive index n of the reduced haze analog from UV to NIR retrieved with spectrophotometry on the MgF₂ sample and ellipsometry on the doped Si sample. Direct calculations from transmission (purple data points) with the Swanepoel method are fitted to a Cauchy law (red curve). Indirect calculations with a Tauc–Lorentz model are performed on transmission data (green curve) and ellipsometric data (black curve). Also, n is retrieved using a Sellmeier model (cyan curve) and a Cauchy model (blue curve) on our ellipsometric data.