Comparison of the monochromatic luminosities at 1350 Å and 5100 Å (left, a), the FWHM of the Hβ line and the C ivλ1549 line (middle, b), and virial black hole masses based on the C ivλ1549 line and Hβ line (right, c). Our sample of N-loud quasars are shown as red circles. Gray and yellow circles denote SDSS normal quasars at 1.5 < z < 2.2 in luminosity ranges of log λL1350 > 46.5 and log λL1350 < 46.5 from Shen & Liu (2012). Errors represent 1σ uncertainties of measurements, excluding systematic errors. The one-to-one relations are indicated by dashed lines for each panel.
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