Influence of porosity for spherical a-SilFe,FeS (left panels), a-C (middle panels), and a-C:H (right panels) grains with radius a = 0.1 μm and porosity degree P = 10, 20, 30, 40, and 50% plotted in blue, green, pink, red, yellow, and brown, respectively. Top panels: Qsca ∕(Qabs + Qsca). Bottom panels: g = ⟨cos θ⟩.
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