Comparison of C¹⁸O observations (black lines) with a thin disk model (colored lines) that includes foreground components. The left column shows moment 0 maps with the red and blue lines showing red and blueshifted emission, respectively. Source positions are marked as in Fig. 2. The middle column compares the spectral profiles with and without foreground. The right column presents the image-space PV diagrams. The models shown here have two foreground components (at 1.6 and 3.0 km s^-1) and the resolved-out envelope component (at 4.0 km s^-1). Contours both for observations and models are the same as those in Fig. 2. M_∗ and i for all models are shown in the right panel.