Fig. 5.
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Spectral comparison of ZTF J2252−05 (black) and WD 2253−062 (red). Bottom: Spectrum of WD 2253−062 obtained with the G130M grating, degraded to match the resolution of the ZTF J2252−05 observation with the G140L grating. Top: Zoomed-in view of the potential ISM-contaminated regions around O I 1304 and C II 1335 Å. Both spectra were continuum-normalised.
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