Brightness temperature profile along the disk major axis as a function of deprojected radius. Gray solid lines show the observed dust continuum brightness profile at 230 and 240 GHz. Peak brightness temperatures of ¹³CO (black +), HCO⁺ (blue crosses), HCN (green diamonds), and SO (orange squares) are also plotted. The smaller symbols show the observed peak temperatures at velocities between 1 and 4 km s⁻¹ and 9–12 km s⁻¹ that contain >3σ emission, while the large symbols indicate the averaged values of these points. For comparison, a power-law () and the Chiang & Goldreich(1997; CG97) temperature profiles are also shown (dashed lines). The values of T₀ and q are indicated in the legend. The vertical purple dashed-dot line indicates 0.5× the beam size, while the horizontal blue line denotes the water snowline at 160 K (Meijerink et al. 2009).