Fig. 10
H i spectra at different positions in the envelope, arcs, and linear bar. The spectrum of the “off-position” taken at 11′ to the west and 10′ to the north of the central target has been subtracted. The position at 6′ to the east is situated in the arc detected with Herschel. The right bottom panel shows the on-source Betelgeuse − off-source H i spectrum and the H i spectrum in the linear bar. The vertical line marks the CO vLSR of Betelgeuse.
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