Modeling results and observations of the ¹²CO emission for the best-fitting physical model for gas and dust (Fig. 4) comparing δ_gas (gas density drop inside the dust cavity). δ_gas is varied as 10⁰, 10^-1, ..., 10^-4 as blue, light blue, green, yellow, and red in the left and middle plots, while the observational data are plotted in black. Left: the ¹²CO spectrum integrated over the disk area. Middle: the intensity cuts through the major (bottom) and minor (top) axis of the ¹²CO zero-moment map for different δ_gas. The noise level is indicated by the gray area. The model images are convolved with the same beam as the ALMA observations. Right: the best-fitting result for possible values of δ_gas and δ_dustcav in red and blue.