Comparison of modeled and observed ¹²CO J = 6−5 intensity profiles and spectra, showing the intensity profile and total spectrum of models with different slope γ of the gas and dust surface density profile (Σ ∝ r^−γ). Left panel: adopted surface density profiles with variations of the representative model. The red line is the representative model. Center panel: intensity profile extracted along the major axis of the disk. The vertical dashed line indicates the radius of the dust-free cavity. Right panel: total spectrum. The yellow region indicates regions affected by the foreground. Vertical dashed lines show the source velocity v_s = 4.55 km s^-1 and velocities v_s ± 4 km s^-1 representing velocity ranges corresponding to the inner disk (radii ≲60 AU).