Integrated intensity maps for C¹⁸O J = 2 detected by the SMA (panel a), by the IRAM 30 m telescope (panel b), and in the combined interferometric SMA and single-dish IRAM 30 m data (panel c). All lines are integrated between 10 and 15 km s⁻¹. Contours are at 5, 10, and 15σ (σ_SMA = 0.37 Jy beam⁻¹ km s⁻¹, σ_IRAM 30 m = 5 Jy beam⁻¹ km s⁻¹, σ_{SMA+IRAM 30 m} = 0.40 Jy beam⁻¹ km s⁻¹). Panel c: white area outlines the primary beam of the SMA observations. The synthesised beams are displayed in white in the bottom left corner of each panel. The white stars mark the positions of the targeted B35A sources.