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Fig. 3
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12CO(1–0) integrated intensity map (Oka et al. 1998) of the helix stream (shown in Figs. 1 (right) and 2) in the velocity range 100–200 km s−1. The white straight line AB used to construct the PV diagram is marked. The five positions used for SiO observations are marked as × and are labelled.
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