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Fig. 5
Portion of the NIR spectrum of QSO J0003-2603 at z = 4.125 reduced using the X-shooter/Reflex pipeline, version 2.5.2 (top) and our own idl pipeline (bottom). The tickmarks in between spectra indicate Mg ii and Mg i absorption lines in a DLA at z = 3.390. The bottom spectrum is much less affected by the residuals.
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