Fig. 3
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Zoom over the spectra used for the radial-velocity measurement of Wd1-1048. Coloured lines correspond to epochs as indicated in the legend. Left: DIB 1.527 μm absorption in the five epochs, adopted as wavelength reference (vertical red dashed line marks the rest frame wavelength). Right: He I 1.70 μm line in the five epochs after realigning the spectra. Wd1-1048 is a known RV variable and possible eclipsing binary (Ritchie et al. 2022).
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