Refractive indices n (top) and k (middle & bottom) from UV to FIR of exoplanet haze analogs produced using the PAMPRE and COSmIC setups from a mixture of 95% N₂–4% CH₄–1% CO. The n and k data obtained for the Pluto and Exoplanet 1 analogs produced from different CH₄/CO ratios in an N₂-dominated gas mixture (see Table 1) are shown. The previous data of Drant et al. (2024) obtained for an exoplanet and/or early Earth haze analog produced with 95% N₂–4% CH₄–1% CO₂ is also plotted to compare the effect of CO vs. CO₂ on the refractive indices of the solid haze analog material.