Velocity offsets relative to z_sys before (panels (a), (c), and (e)) and after (panels (b), (d), and (f)) the correction provided in bold face in Table 7. The numbers reported in parentheses are the standard deviations of the original distributions without the outliers. The mean (solid line) and median (dashed line) are marked in each panel. SDSS J142243.02+441721.2 does not appear on the SDSS pipe panel, for clarity, because of its abnormally large velocity offset. The outliers that were removed are discussed in Section 4.