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Fig. 4.


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Magnitude-redshift diagram of WLQs for 1.5 ≤ z ≤ 3.5. Red symbols: WLQ sample from Diamond-Stanic et al. (2009) (framed crosses); EW-selected sub-sample (EW(C IV) < 4.8 Å) from Meusinger & Balafkan (2014) (squares); and VPMS J1708+4332 (asterisk). For comparison, the distribution of all SDSS DR7 quasars from the Shen et al. (2011) catalogue is marked by the median relation (thick blue curve) and the standard deviation (hatched green area).

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