Comparison of an example model SED with single grain sizes varying between 0.005 and 0.5 µm. The colour coding is described in the legend of this figure. The same SED, but for a grain size distribution with 0.005 µm < a < 0.5 µm, n(a) ∝ a^−3.5 is shown as black solid line. The fixed parameters of the model are M_d = 1.4 × 10⁻⁴ M_⊙, R_out = 6.24 × 10¹⁶ cm, T_* = 11905 K, and L_*, = 1.56 × 10⁸L_⊙.