Our best-fit model in a wired representation showing the observer’s point of view and its angle with respect to the plane of the sky. Each structure is shown in a different colour and separately: green is for the outer shell, purple for the ring, red for the central cylinder, bright yellow for the spheres, and light yellow for both the outer and inner parts of the tips. The shell and ring are shown together, as the ring is only a limited region of the shell meant to define the locations of the species, but its physical properties are the same as in the shell. Values are provided for the main dimensions of each structure. Pictures of independent structures are not to the same scale. Note that 3.6×10¹⁶ cm subtends 1″.0 at the assumed distance of 2500pc.