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Fig. 1.

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Combined spectrum of SB2. Top panel: Flux density in arbitrary units is shown in black, with the dashed purple line denoting the flux density error. Bottom panel: S/N per 1 km s−1 pixel. The shaded green area highlights the Lyman-α forest considered in the redshift drift measurement, bound by the Lyman-α and Lyman-β emissions of the quasar, namely between 509−603 m.

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