Top-left: integrated intensity map of the DCO+ J = 3 − 2 line from 5.4–8.8 km s−1 after applying a Keplerian mask to the image cube. The synthesized beam and AU scale are shown in the lower corners. Top-right: DCO+ J = 3 − 2 integrated intensity map overlaid with white marking the model inner dust cavity, the inner dust ring (R1 , hatched), the dust gap, and the outer dust ring (R2, hatched). The synthesized beam and AU scale are shown in the lower corners. Bottom-left: velocity-weighted coordinate map of the DCO+ J = 3 − 2 line, clipped at 3.5σ. Solid black contours show the 233 GHz/1.3 mm emission at 7.0 × 10−5 Jy beam−1 (1σ) × [5, 50, 200]. The synthesized beam and AU scale are shown in the lower corners. Bottom-right: disk-integrated spectrum of the DCO+ J = 3 − 2 line before Keplerian masking, Hanning smoothed to 0.17 km s−1 channels. The horizontal dashed black line indicates the continuum-subtracted spectral baseline. The vertical red line shows the systemic velocity at 6.9 km s−1 .
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