NOEMA images of the circumstellar disk around AB Aur. The 1 mm continuum dust emission map, and the velocity-integrated intensity images from 3.5 to 8 km s^-1 of the ¹³CO J = 2 → 1, C¹⁸O J = 2 → 1, SO J = 5₆ → 4₅, and H₂CO J = 3₀₃ → 2₀₂ lines. White ellipses in the bottom left corner of each panel represents the beam size (~1.̋6 ×1.̋5). Contour levels are 50% to 90% in steps 10% of the maximum value (34 mJy beam^-1 for the continuum, 37 K × km s^-1 for the ¹³CO J = 2 → 0, 15 K × km s^-1 for the C¹⁸O J = 2 → 0, 2.3 K × km s^-1 for the H₂CO J = 3_0,3 → 2_0,2, and 1.0 K × km s^-1 for the SO). The thick blue contour indicates the 50% level of the C¹⁸O emission. The arrow shows the direction of the ionized jet (Rodríguez et al. 2014).