¹²CO P(9) line-profiles predicted for different gap sizes and diverse column densities inside the gap, for the best-fit grid model (see Fig. 13), compared with composite ¹²CO line-profile. Observed and modeled line-profiles are normalized such that the continuum is at zero and the line peak at 1. The color code in the surface density density panel corresponds to the color in the line-profile plot. The solution without gap is displayed in black. The temperature profile is kept constant in all the models. Error bars are 1σ.