Sky models and simulated observations (Sim. Obs.) by simalma are shown. The beam shape and scale bar of 2000 au are marked. No contour levels are shown for G210.97–19.33S2, because no pixels brighter than 3 σ are found. The contour levels for G208.68–19.20N3 Sim. Obs. are 3σ, 5σ, and 7σ (1σ =0.04 mJy beam⁻¹). The contour levels for G208.68–19.20N1 Sim. Obs. are 3σ and 30σ. The contour levels for G208.68–19.20N2 Sim. Obs. are 3σ and 5σ.