Surface density profile of the representative model. Gas and dust surface density are given in blue and red lines, respectively. The dashed black lines show the gas/dust surface density if there were no cavities (Eq. (1)). Dashed green lines indicate the outer radii of the inner warm disk, the gas-depleted hole, and the dust-free cavity (Table 3). In the gas-depleted hole, only upper limits on the gas surface density profile can be derived from the observations.