Moment-8 PV diagrams of various molecular transitions along the disk plane (PA=53°). The offset is relative to the phase center of the observations. The horizontal and vertical lines mark the systemic velocity and the position of the 1.4 mm continuum peak, respectively. The crosses in the bottom left corners indicate the angular and spectral resolutions. (a) PV plot of the CH₃CN(12–11) K=3 component (contours) overlaid on that of the DCN(3–2) line. Contour levels range from 7 to 91 in steps of 12 mJy/beam. (b) Same as panel a, with CH₃CN(12–11) K=7 overlaid on K=3. Contour levels range from 5 to 53 in steps of 6 mJ /beam. (c) Same as panel a, but with ${\mathrm{C}\mathrm{H}}_3^{13}\mathrm{C}\mathrm{N}$(12–11) K=2 overlaid on CH₃CN(12–11) K=2. Contour levels range from 5 to 20 in steps of 3 mJy/beam.