Total reflected flux, I_λ (top), polarized flux, PI_λ (middle), and degree of polarization, P (bottom), as a function of wavelength, λ, for a cloudy atmosphere. The fluxes are normalized to the total reflected flux of a ringless planet at a phase angle of 0° at a wavelength of 0.55 μm. At this wavelength, the planet has a geometric albedo of about 0.27. In addition, the single scattering albedo of CH₄ is shown in the top panel. See Sect. 4.6 for details.