Left: integrated emission map of HCO⁺ (blue) from 0–12 km s^-1 with contours showing 3, 10, and 17σ emission (σ = 25 mJy beam^-1 km s^-1). The white-bordered black line shows the positions from which we constructed the position–velocity diagram (middle-left), and the gray box shows the smaller region for which we show H¹³CO⁺ and DCO⁺ line emission (middle-right and right). Middle-left: the HCO⁺ position–velocity diagram. The magenta curves show the Keplerian velocity profile for an assumed stellar mass of 2.3 M_⊙, disk inclination of 44°, and systemic velocity of 5.8 km s^-1. Middle-right: integrated emission map of H¹³CO⁺ (green) from 0.8–10.4 km s^-1 with contours showing 3, 5, and 7σ emission (σ = 14 mJy beam^-1 km s^-1). Right: integrated emission map of DCO⁺ (red) from 0.8–10.4 km s^-1 with contours showing 3 and 5σ emission (σ = 18 mJy beam^-1 km s^-1). The 19 K contour of the midplane temperature at a radius of 155 AU in the model disk is overlaid on the DCO⁺ emission using a white-bordered black ellipse. In the maps of integrated emission, the ~065 × 044 beam is shown in the lower left, while a scale is shown in the lower right.