Fig. A.1
Unreddened quasar spectra. The observed/rebinned spectra are indicated by black lines/filled blue squares, while the red dashed lines represent the best fitting spectra resulting from the χ2 analysis. The gray bands report regions of bad atmospheric transmission. In each panel, the name and the redshift of the quasar is shown at the top left, while the best fitting slope is reported at the top right.
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