Properties of the reference CPD with χ = 2 × 10⁶ and R_out = R_Hill (a,b,c,d). The majority of the ¹²CO v =1-0 line emission originates from within the green “box” region in panels a-d. The dotted contour lines in panels (a,b,c,d) represent minimum optical extinction A_V surfaces of 1 (dotted line), 10 (dashed line) in the radial or vertical direction. The gas and dust temperature structure of the CPD is contrasted for illustrative purposes with that of the circumstellar disk in panels (e) and (f).