Position-velocity diagrams of the C4H(N = 24–23) (top) and CN (2032−1021)(bottom) line emission along an 1′′-wide NS slit at the right ascension of the star (09h47m5745). The shells in Fig. 11 where C4H is detected appear as bright elliptical arcs. The white/black ellipse corresponds to shells of radii 17′′, 21′′, 26′′ and 31′′ centred 1′′N from the star (4′′N for the 31′′ shell) and in radial expansion at a velocity of 14.5 km s-1. Note that the CN (2032−1021) line shown here is blended by two weaker hfs components, (2032−1022) and (2033−1023), respectively 11.5 and 16.3 MHz higher in frequency. Those appear on the graph as ghosts of the brightest component shifted by –15.2 and –21.6 km s-1.
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