Extended Data Fig. 7: Refractive index of C₂H₄ ice.

Red lines and dot present (n,k) values from measurements at IR and visible wavelengths⁶⁵. Our estimate based on the gas phase cross section is shown by the gray line. The dashed line presents the results when the k_UV is fitted with a set of Gaussian curves and the solid black line presents the case of a 2,000 cm⁻¹ blue-shift on k_UV. The shaded cyan area present the wavelength range sensitive to haze retrieval from the Voyager observations³⁷. The average k value within this range varies between 0.65 and 0.72 for the dashed and solid line cases, respectively.