Aspect ratio (upper plot), temperature (middle plot), and gas surface density (bottom plot) asa function of orbital distance for four different initial gas surface densities, from 100 g cm⁻² to 2000 g cm⁻². The turbulence parameter in viscosity is α = 10⁻³ in the left panel, α = 5 × 10⁻⁴ in the middle panel, and α = 10⁻⁴ in the right panel. The fragmentation velocity is u_f = 1 m s⁻¹. The light blue areas in the aspect ratio and temperature plots indicate the evaporation fronts (±2 K around the evaporation temperatures of CH₄, CO₂ ; ±10 K for the other species). Starting from the outer boundary, for α = 10⁻³ the species that evaporate are CO, CH₄, CO₂, H₂O, Fe₃O₄, C, FeS, Mg₂SiO₄, and MgSiO₃. For α = 5 × 10⁻⁴ the evaporation fronts are of CO₂, H₂O, Fe₃O₄, C, FeS, Mg₂SiO₄, and MgSiO₃ and for α = 10⁻⁴ they are CO₂, H₂O, and Fe₃O₄. The water ice line is shown as a dashed line.