Radial profiles of C¹⁸O emission for three different disk models compared to the observational data of Facchini et al. (2021). The grey band shows the width of the major axis of the beam. In each case, the relevant parameters are listed in the top right corner of the figure. From left to right: in model a, the inner disk is almost completely removed, and there is effectively no gas or dust from R_cav inward. In model b, the inner disk is replaced, with the noted depletions of gas and dust. Finally, in model c, the same inner disk parameters are used, but between R_gap and R_cav, the gas is depleted by a further factor.