NOEMA data. The color map shows the distribution of the rotational temperature derived by fitting with XCLASS the emission of the CH₃CN J_K = 12_K–11_K (K = 0–6) lines (including the CH₃ ¹³CN isotopologs). The plotted region corresponds to the area in which the 1.37 mm continuum emission is higher than 16 mJy beam⁻¹. The black contours reproduce the 1.37 mm continuum, showing the same levels as in Fig. 7: the positions of the three strongest 1.37 mm peaks are indicated using the same labels as in Beuther et al. (2018, see Table 5). The restoring beam of the CH₃ CN maps is shown in the lower right corner of the panel.