Tomographic view of the observed spectral lines showing the mean brightness as a function of radius and height (both in au). Original beam sizes are indicated in the upper-right corner of each panel. CN hyperfine transitions are labeled by their frequency in MHz. Contour levels are 0.5-2 by 0.5, 3-10 by 1, and 12-30 by 2 K (except for the weak para-H₂CO line, contour, at 0.25 K only). The panel labeled “CN Singles” shows a weighted average of three unblended lines at 338 516, 340 008, and 340 019 MHz, which is shown with a contour step of 0.25 K. The continuum at 230 GHz is shown in the bottom-left panel with contour levels 0.1, 0.2, 0.4, 0.8, and 1.2 K.