IRAM30 m maps of the HCO⁺ (1−0) and HCN (1−0) line intensities integrated in the 15−50 km s⁻¹ and 50−85 km s⁻¹ ranges. Contours in panels a and c represent the hard X-Rays emission integrated from 3 to 79 keV, using the 2015 NuSTAR data (Zhang et al. 2015). Gray: 19 × 10⁻⁶ ph s⁻¹ pixel⁻¹. Cyan: 22 × 10⁻⁶ ph s⁻¹ pixel⁻¹. Red: (24, 26, 28) ×10⁻⁶ ph s⁻¹ pixel⁻¹. Dashed white lines delineate the regions with no X-ray observations. Contours inpanels b and d represent the 350 μm data from 8 to 68 by 20 (× 10³) MJy sr⁻¹.