Fig. 2
HST/COS G130M O I 130.2 nm. Solid line: combined HD 189733 and background geocoronal lines obtained on egress (dataset lbavdq). The thin feature is the star emission and the broad one is the Earth line emission filling the 2.5 arsec aperture. Dotted line: independent spectrum of the geocoronal O I emission line that was scaled to subtract the sky background contamination from the stellar observation.
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