Results from the non-LTE analysis. Upper panel: results from the χ² minimisation for the −2 km s⁻¹ component simultaneously fitting the A and E forms with a ratio equal to unity and the ¹³C E methanol transition with a ratio of 68. The minimum therefore has to be multiplied by two to obtain the A+E forms of methanol. Middle panel: density and temperature range obtained for the best-fit methanol column density of 2 × (7 × 10¹⁷) cm⁻² and source size of 0.15″. Bottom panel: observed integrated intensities versus modelled ones as a function of the upper energy level value with respect to the lowest value. These are 7.9 K for E methanol (red filled circles) and 0 K for A methanol (red filled stars). The ¹³C E methanol is represented as a red filled triangle.