AFGL2591 continuum emission at 1.37 mm. The green contours show the 1.37 mm continuum emission with levels at −3 (dashed), 3, 5, 10, 20, 40, and 80σ (σ = 0.59 mJy beam⁻¹). The beam size (0″. 46 × 0″. 36) is shown inthe lower left corner. The green star indicates the position of the 1.37 mm continuum peak. The white rectangle shows the region within which an average spectrum was obtained in the spectral line data for line identification (Sect. 3.2).