Rotation diagrams based on our selected methanol transitions (Table A.1) and separated by methanol symmetric type (E–CH₃OH and A–CH₃OH). Straight black lines represent our best fits to the data considering only methanol lines not blended with other methanol lines (see Sect. 4.1) and following LTE conditions. Dotted gray lines are the slopes of the complementary methanol symmetric type in the same region. Maser candidates (see Sect. 4.1) are labeled with symbols. Points are color-coded depending on their critical densities (in units of cm⁻³), as indicated by the color bar to their right (transitions with unavailable critical densities are in black). In the bottom left corner of each panel, the column density (N_{E − CH3OH} and N_{A − CH3OH}, in cm⁻²) and the excitation temperature (T_ex, in Kelvin) derived from the fit are indicated. Non-blended lines in LTE are marked by circles, while methanol lines blended with other methanol lines (at E_up/k > 150 K) are assigned by stars. Shaded areas represent 1σ uncertainties (see Sect. 4.1).