Left: integrated B3 12CO(1–0) spectrum obtained in a circular, 7′′ wide region centred on U Ant. Middle: enlarged 0.65 km s-1 resolution velocity channel maps at ±18.5 km s-1 relative to the systemic velocity. Right: illustration of the geometry when selecting special velocity channel maps of a double shell structure, first as seen by the observer as in the middle maps and second in a hypothetical side view with the green line indicating the spatial cut corresponding to the chosen velocity channel.
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