Top panel: ¹²CO J = 2 → 1 channel maps from the 30-m observations at 112 resolution. The field of view is 90′′. The insert shows the spectrum toward AB Aur at higher spectral resolution. Contour spacing is 2 K. Bottom panel: combined ¹²CO 30-m + SMA image at 7.4′′ resolution. Contour levels are 1 to 5 K by 1 K, then every 5 K (1 K = 0.42 Jy beam^-1 at this resolution). In the cleaning, the residual are around 0.2 Jy beam^-1 in the 16 inner channels.