Results of the power-law fitting of the simulated ¹³CO line intensityprofiles obtained with the self-similar disk models with M_disk = 10⁻⁴ M_⊙. The values of the fitted power-law index γ_fit are shown by the filled dots as a function of the radial range in which the fitting was carried out. The model input power-law indexes are shown by the dashed lines. The dotted line shows the starting point of the fitting R_start .