Fig. 11

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Horizontal (left) and vertical (right) position-velocity diagrams through the center of bubble D (marked in each panel) derived from the [CII] line emission. The contour levels are in 3σ steps. The black dotted lines outline the elliptical shape a spherical shell would have in the pv diagram – given a radius of 80″ and expansion velocities of 6 km s−1.
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