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Fig. 3
Spectrum and continuum of the quasar SDSS J134826.65+290623.0. This quasar belongs to the sample of SDSS z ~ 3 quasars that is used to derive the PCA eigenvectors (Sect. 3). Our estimate of the continuum is shown with the thick red line and a zoom of the Lyman-α forest region is shown in the inset.
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