Distributions of the Eddington ratios η of quasars. The black solid line is for all the quasars with z_em < 1.07 (2724 quasars), whose black hole mass is available from previous works. The median value is ⟨Log η⟩ = −1.069. The blue solid line is for the quasars with outflow Mg II NALs (338 quasars), whose median value is ⟨Log η⟩ = −1.007. The red solid-line is for the nine quasars with inflowing Mg II NALs, whose median value is ⟨Log η⟩ = −1.113.