Fig. 2
Equivalent width WC iv of the C iv λ1549 line versus equivalent width WMg ii of the Mg ii λ2798 line for the quasars from the WLQ sample with 1.50 ≤ z ≤ 2.22 (filled red squares) and for 35137 quasars in the same redshift range from the Shen catalogue (equally spaced logarithmic local point density contours estimated with a grid size of Δ = 2 Å on both axes).
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