Observations of ¹³CO (2–1) emission in the DL Tau disk. Shown is a pixel-deprojected Keplerian plot consisting of the three panels: (left) the radial profile of the line brightness temperature (K), with observations and errorbars in black, and profile derived from the best-fit disk model in red, (top) the integrated spectrum (black line) overlaid with the best-fit Gaussian profile (red line), and (bottom right) aligned and stacked line intensity (K) as a function of disk radius (Y-axis; au) and velocity (X-axis; km s⁻¹). The color bar units are in Kelvin.