Column density (top left panel), velocity offset (top middle panel), full width at half maximum linewidth (top right panel), and rotational temperature (bottom left panel) maps obtained by fitting CH₃CN (12_K−11_K), K = 4−6 and lines simultaneously with XCLASS. The black contours correspond to the continuum image in the AB configuration, start at 6σ and increase in steps of 3σ (see Table 4). Bottom right panel: observed spectrum of a given pixel drawn in black and overlaid with the resulting fit for CH₃CN (12_K−11_K), K = 4−6 in red and the marginally detected in blue. The dashed red line corresponds to the predicted fit for the CH₃CN lines that were not used in the fitting process (see explanation in Appendix B). The bright line detected between K = 4 and 5 components is identified as C₂H₅CN. The corresponding fit parameters are provided in the panel. Regions outside of the most extended combination of 6σ contours of integrated intensity of CH₃CN lines are masked out.