Uranus: imaginary refractive indices for Uranus. The blue line corresponds to the vertically extended photochemical haze and the green line to the concentrated haze located near the CH₄ condensation level from Irwin et al. (2022). Three different ad hoc values (1 × 10⁻¹, 1 × 10⁻², 1 × 10⁻³) in the thermal infrared (>2 µm) are added (red lines). For reference, refractive indices of tholins (Khare et al. 1984), ice tholins (Khare et al. 1993) and black carbon (Jäger et al. 1998) are also shown in solid, dotted-dashed and double dotted-dashed black lines respectively.