RADEX results for CH₃CN. Yellow and dark blue contours show where observed and modelled integrated intensities match, while teal, light blue and pink contours show the same but using ratios of integrated intensity. Dashed contours and shaded areas represent uncertainties, respectively. The grey scale shows the opacity of the 5₀–4₀ transition in all panels. The K = 0 and K = 1 lines cannot be separated due to blending and were, therefore, considered as one component. The black cross shows the most probable result for T_kin and n(H₂) determined by minimising χ² that is, where . The closed black contours indicate a confidence level of 95.45%. The respective source and velocity component are shown in the lower left, the best-fit decimal power of column density (in cm⁻²) in the upper left corner.