Differences in the SED resulting from different dust species. The solid line represents the large dust grains and the dashed line the small dust grains. In both cases an unperturbed circumstellar disk of M = 2.67 × 10^-2 M_⊙ is used. A G type star hosts this disk with an inner radius of R_in = 38 AU and an outer radius of R_out = 171 AU. In the wavelength range between 730 μm and 3.3 mm, the spectral index for the large grains is α_spec,large = 2.84 ± 0.01 and for the small dust grains α_spec,small = 3.96 ± 0.01.