Physical conditions for the methanol maser candidates (see Table 2) derived from our rotation diagrams. The x-axis indicates the number of the region. The y-axis represents, from top to bottom, (1) the ratio between the nominal upper level column densities of the lines N_up, MASER and the expected values from our best fit to LTE conditions N_up,LTE, (2) the total column density, (3) the difference between total E– and A–type column densities, (4) the LTE excitation temperatures and (5) the difference between the A– and E–type excitation temperatures. Shaded areas highlight regions were maser emission in the J₋₁ → (J − 1)₀ − E line series (at 84, 132, and 229 GHz), and the J₀ → (J − 1)₁ − A⁺ line series (at 146 and 198.4 GHz), are observed, according to the first panel.