Fig. 11
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Top: distribution of the ratio of Si IV to C IV emission line flux for the Excess Si IV emitters group (orange) compared to all quasars in the Wu & Shen (2022) catalog (blue). The Si IV to C IV ratio centered around 1 signifies an enhanced Si IV emission, where the Si IV emission line is as strong as the C IV line. Bottom: distribution of the ratio of Si IV to C IV emission line flux for the Si IV deficient group (orange) compared to all quasars in the Wu & Shen (2022) catalog (blue).
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