Comparison between T(r) (gray line) and the radial profile of T_ex of all CH₃OH lines from the best-fit model with modified radial density profiles (left) and original density profiles (right). The best-fit abundance profiles are at 0.8 Myr from Vasyunin et al. (2017), which were scaled down by a factor of 5 and 10 in the left and right panels (of model A and model B), respectively. The cosmic microwave background temperature of 2.73 Κ is also indicated (black horizontal line). The four J₀−J₋₁ lines are shown with thicker line widths.