Fig. 2
Top: median composite spectrum from the final quasar sample with fitting power-law continuum. Second row: the semi-interquartile range, SIQR, in units of the median. Third row: relative deviation from the Vanden Berk et al. (2001) composite ([here-Vanden Berk]/here). Bottom: number of spectra per wavelength bin used for the construction of the composite.
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