Mean H¹³CN (J = 4–3) velocities and models of rotating circular rings for the CND. Left: observed velocities as a function of position angle on the sky (from north to east). Colors represent the same intensity scale as in the integrated line intensity image shown in the right panel. Curves show models of rotating, tilted rings with a circular velocity v_ϕ = 110 km s⁻¹, θ =30°, and differentinclination angles i. Right: integrated intensity map and resulting orbits (with a deprojected radius of 1.7 pc in this example).