Fig. 2.
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Average (black) spectra for the C IV, C III], and Mg II emission lines with one (dark blue, red, and green) and two (light blue, red, and green) sigma intervals. We did not take into account noisy spectra and spectra that show absorption features in the line core (as in the case of Mg II in SDSS J1004+4112). The y-axis is in arbitrary units of flux.
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