Onsala data. Panel a: C¹⁸O(1–0) ∫T_mbdv. Lowest contour and step: 0.6 and 0.2 K km s⁻¹; panel b: CS(2–1) ∫T_mbdv (colour scale and black contours; lowest contour and step: 0.35, 0.2 K km s⁻¹) with CH₃OH(2–1) ∫T_mbdv (white contours; lowest contour and step: 0.15 K km s⁻¹) superimposed; the combined area under the two emission lines with the lowest upper level temperature (E and A+; Table 4 and Fig. 14) are shown. The red and blue arrows indicate the approximate direction of the outflow detected in CO(3–2) (see text). The small white crosses indicate the positions where both CS and CH₃ OH were observed; the black dots are for CS only. Panel c: CH₃OH(2–1) ∫T_mbdv for the A+ component (see Fig 14) only. Lowest contour and step: 0.15, 0.1 K km s⁻¹. Panel d: as c, but for the E-component only. In all panels, the white crossed circle indicates the position of the 850 μm peak, which is also that of the embedded YSO. All offsets are relative to the 2MASS YSO position (see Table 1).