Position-velocity diagram in the central region: the CO(2–1) emission, as traced by ALMA observations, along two 0.4′′-wide 20′′-long slits, repectively oriented NS and EW, and passing through the star. The dense shells seen in Fig. 7 appear as bright elliptical arcs. The white ellipses correspond to shells of radii 1.5′′, 2.5′′, 5.5′′, 10′′, centred within 0.1′′–1′′ from the continuum peak and in radial expansion at a velocity of 14.5 km s-1.
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