Rotational diagram of the 12–16 November average of the methanol lines around 166 GHz in comet 67P. The neperian logarithm of a quantity proportional to the line intensity is plotted against the energy of the upper level of each transition. The fit is shown with a solid red line and errors are displayed with red dashed lines. The black dots are the measurements and green circles are the predicted values for a model with a gas temperature of 36 K.