Primary beam corrected integrated intensity maps for CH₃OH J = 5₀−4₀ A⁺ transition (E_u = 34.8 K) at 241.791 GHz detected by the SMA (a), by the APEX telescope (b), and in the combined interferometric SMA and single-dish APEX data (c). All lines are integrated between 6 and 12.5 km s⁻¹. Contours start at 5σ (σ_SMA= 0.16 Jy beam⁻¹ km s⁻¹, σ_APEX= 2 Jy beam⁻¹ km s⁻¹, σ_SMA+APEX = 0.17 Jy beam⁻¹ km s⁻¹ ) and follow in steps of 5σ. The circular field-of-view corresponds to the primary beam of the SMA observations. The synthesised beams are displayed in white in the bottom left corner of each panel.