Top: model A, bottom: model B. Comparison between modeled spectra and those detected by 30 m telescope toward AB Aur disk. In colors we see the synthetic line profile obtain with our model. The blue and magenta lines correspond to the same model with inclination angles for the disk of 27^◦ and 40^◦ respectively. Vertical dash line indicate the V_lsr = 5.9 km s^-1 (Duvert et al. 1986).