Top left panel: CS (5–4) integrated-intensity emission map as seen with ALMA (project number 2012.1.00239.S, see Sect. 3.4). The contour levels are at 3σ (where 1σ = 7.5 mJy beam⁻¹ km s⁻¹). Middle left panel: CS (2–1) integrated-intensity emission map as seen with NOEMA over the line profile (corrected for primary beam attenuation). The contour levels are at 3σ (where 1σ = 8.3 mJy beam⁻¹ km s⁻¹). Bottom left panel: SO (2-1) integrated-intensity emission map as seen with NOEMA over the line profile. The first contour is at 2σ and the levelstep at 1σ (where 1σ = 6.6 mJy beam⁻¹ km s⁻¹). For each map, the synthesized beam is shown in the bottom left corner. Positions of sources MMS-1, MMS-2, and MMS-3 along with that of the methanol peak (or blob) are indicated. Right panels, from top to bottom: spectra of the CS (5–4), CS (2–1), and SO (2–1) spectra taken in direction of the methanol blob. Dashed red lines indicate a V_LSR = 6.4 km s⁻¹.