The plot of broad Mg II line luminosity and continuum luminosity at 3000 Å. The solid line is the OLS bisector linear fit to radio-quiet AGNs in Kong et al. (2006), . The open circles are FSRQs, solid circles are SSRQs, and open triangle is SDSS J001130.40+005751.7. The vertical dashed line represents the luminosity range at 3000 Å assuming its variation is identical to that in the r band, which is connected by two rectangles. The dotted lines show the one order of magnitude deviation of continuum luminosity at 3000 Å from the solid line.