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Fig. 1.
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Average HST/COS spectrum of ZTF J2252−05 covering 900–2050 Å. Masked regions include areas of low sensitivity (< 1100 and > 1850 Å; grey) and geocoronal Lyα at 1215 Å (shaded). Night-only data were used to reduce airglow contamination. The error of the averaged flux is shown in red.
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