Rosseland mean opacities κ_ross as a function of temperature for the three different compositional assumptions. We use a 50:50 mixture between water andsilicates, the complex chemical model without carbon grains and with carbon grains noted as v_{Y, no C} and v_{Y, w C} in Table 1, respectively. We only show here the opacities for μm-and mm-sized dust. A clear difference between the different chemical compositions is visible.