Distribution of rest-frame equivalent width of [O iii]λ5007 line. The black line histograms denote our sample of 13 N-loud quasars, the dark gray filled histogram shows our observed 11 N-loud quasars, and the open histogram shows the 3σ upper limit. The result of SDSS J1707+6443 (Araki et al. 2012) is shown as a light gray filled histogram. The gray line open histogram denotes the distribution of 232 SDSS quasars at 0 < z < 1 in a luminosity range at log λL5100 = 45.5–46.5 (Shen et al. 2011), which is divided by five to compare with our sample easily.
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