Position-velocity diagram of the CO(2–1) emission, as traced by the SMA+SD observations, along an 3′′-wide 220′′-long slit oriented NS at the right ascension of the star (13h:16m:43.9s). The central region of the graph (− 40′′<r< + 40′′) is heavily saturated. The dense shells seen in Fig. 7 take here the form of elliptical arcs. The white ellipses correspond to spherical shells of radii 38′′, 48′′, 78′′, 99′′,107′′, centred within 2′′ from the continuum peak and in radial expansion at a velocity of 14.5 km s-1.
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