IR absorption spectrum of crystalline C₆H₆ ice deposited on a Titan tholin sample at 156.8 K. Major absorption bands for C₆H₆ ice are indicated with the Wilson notation. The ν₆ + ν₁₅ combination mode follows the Herzberg notation, as it is the only notation available. Atmospheric correction was applied to the spectrum to remove features due to residual carbon dioxide and water vapor in the portion of the beam path outside the vacuum chamber.