SiS υ = 0 (J = 12-11) ALMA data. Natural weighting and tapering were used to restore the emission maps with a half-power clean beam width of HPBW=0″.06 × 0.06. Top: velocity-channel maps (contours: 2σ, 4σ, … by 4σ; σ = 0.57 mJy beam⁻¹). Bottom-left: integrated intensity map over the velocity range V_LSR = [18:52] km s⁻¹. Bottom-center: first-moment map; contours go from V_LSR = 18 to 52 by 2 km s⁻¹. Bottom-right: integrated 1d-spectrum obtained with ALMA (solid line) and with the IRAM-30 m telescope (light grey area, Velilla-Prieto et al. in prep). The ALMA spectrum has been obtained integrating the line surface brightness over an area comparable to the beam of the IRAM-30 m telescope at this frequency (HPBW ~ 11″). In contrast to SiS, the adjacent ³³SO emission is strongly filtered out by the ALMA interferometer. A Gaussian fit to the SiS profile (over the dark grey area) is represented by the dashed line; the FWHM and V_LSR of the centroid from the fit are indicated in the top-right corner of the box.