Spatially integrated EMIR spectra of emission lines from high-density tracer molecules observable using a single setup in the 3-mm band. The spectra were continuum-subtracted, binned to 50–55 km s⁻¹ resolution, and lines detected at > 3σ were fitted with single Gaussian functions using the CLASS software package from GILDAS (blue curves). Additional tests were performed to confirm that these detections are real (see details in Sect. 2.1).