Mass extinction coefficients (solid lines), absorption coefficients (dashed line), and Henyey–Greenstein phase function g (dot-dashed line, ×100) for model sets A, B, C, D, E, F, and G (three models per panel corresponding to the MRN (a_max = 0.25µm), τ₁ (a_max = 1 µm), and τ₃ (a_max = 3 µm) size distributions, respectively). Model set B includes a size distribution extending to τ₅ (a_max = 5 µm). Below each panel a close-up of the CO₂ stretching mode is shown (which includes CO for the last two sets).