a) CH₃OCHO at 216.966 GHz (background image) and continuum around 219 GHz (contours) emission maps towards IRAS2A. The rms noise level is σ = 1.5 mJy/beam in the continuum, and σ = 2.8 mJy/beam in the CH₃OCHO map (emission from one 2.7 km s^-1 – channel). Contours are levels at 3σ, 5σ, 8σ and then from 10σ to 100σ in 10σ increment. The synthesized beam is (PA 32°). The red and blue arrows show the direction of the main bipolar jet axis (Jørgensen et al. 2007). b) Continuum (real part of the visibilities, black points) and corresponding best-fit power-law model (green dashed line) averaged over baseline bins of 10 m, as a function of baseline length. Residuals are shown as a red line. The zero-spacing flux is extrapolated from the single-dish flux at 850 μm by Motte & André (2001). c) Real part of the visibilities (black points) from the CH₃OCHO (20 0 20 2–19 1 19 1) emission line and corresponding best-fit Gaussian model (FWHM ×, PA 41°, green line). Residuals are shown as a red line.