NOEMA data. The gray-scale map reproduces the 1.37 mm continuum emission, plotting values in the range 10–35 mJy beam⁻¹. The colored dots give the (Gaussian-fitted) positions of the channel emission peaks for the CH₃ CN J_K = 12_K–11_K (K = 3–6) (upper panel) and HC₃N J = 24–23 (lower panel) lines; the color denotes the channel V_LSR. The yellow contours show the JVLA A-Array continuum at 1.3 cm (Moscadelli et al. 2016), showing levels at 70, 80, and 90% of the peak emission of 0.50 mJy beam⁻¹.