Comparison of gas surface density distributions in model v2 with ThES2 and in β-models that takestellar and background irradiation into account. First row: (ThES2)-model 2v, second row: (beta=0.5Ir)-model 2v, third row: (beta=3Ir)-model 2v, and bottom row: (beta=10Ir)-model 2v. The red circles outline the radial distance beyond which the azimuthally averaged angular velocity deviates from the Keplerian rotation bymore than 10%. The time is counted from the instance of disk formation. The scale bar is in log g cm⁻².