Degree of polarisation for single scattering p = −S₁₂∕S₁₁ for a scattering angle of θ = 90° (upper left), albedo (upper right), extinction opacity (lower left), and probability density function Ŝ₁₁ for the scattering angle θ = 90° (lower right). All quantities were calculated for a grain size distribution with q = −3.5, s_min = 5 nm, and different upper grain size limits s_max at a wavelength of 850 μm for graphite (parallel).