Fig. 4.
![Histogram of the velocity offset between Mg ii-based redshift and [C ii]-based redshift ($\Delta v = v_{\rm Mg\, \small {II}} - v_{\rm [C\, \small {II}]}$) for $z \gt 5.7$ quasars compiled from the literature (Maiolino et al. 2005; Venemans et al. 2012, 2016, 2017c; Wang et al. 2013, 2016; Willott et al. 2013, 2015, 2017; Bañados et al. 2015; Mazzucchelli et al. 2017; Decarli et al. 2018), along with our HSC quasars. The Mg ii line is predominantly blueshifted in these $z \gtrsim 6$ quasars with a mean and standard deviation of $-284 \pm 607$ km s$^{-1}$. (Color online)](https://oup.silverchair-cdn.com/oup/backfile/Content_public/Journal/pasj/71/6/10.1093_pasj_psz096/2/pasj_71_6_111_f8.jpeg?Expires=1749874490&Signature=Ur2m67Jqyqp2HEXJYxTm68-NBqadBISYYqgWgBc31f~c~O1L8wEPbNnuSmdai0uVsRWZbLtNMyTb2CHOlrnpOXtRVtdxTt8UWklnQWwRFOzeizqfnIE9jwc9NTKBCy6z7vi1-7d7sTtsa31vUpHRhzdhmvze-NUaVxv0kj9LAyt12xx78KciN42x1GL13XYY-Hw15JvjQDT6JtMszrKFOt1W9Cf6zteLibTAABp7tNEUbhHR8MgAlesGpREIFdAruETLIGvHG6OOYECyK7HWMbp5AK5miRp1ghyVnC0pIs9mNCSOH5lSzJeSIrF9W5qbCSz7uGmAE3VCq~sgawHn~w__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
Histogram of the velocity offset between Mg ii-based redshift and [C ii]-based redshift (|$\Delta v = v_{\rm Mg\, \small {II}} - v_{\rm [C\, \small {II}]}$|) for |$z \gt 5.7$| quasars compiled from the literature (Maiolino et al. 2005; Venemans et al. 2012, 2016, 2017c; Wang et al. 2013, 2016; Willott et al. 2013, 2015, 2017; Bañados et al. 2015; Mazzucchelli et al. 2017; Decarli et al. 2018), along with our HSC quasars. The Mg ii line is predominantly blueshifted in these |$z \gtrsim 6$| quasars with a mean and standard deviation of |$-284 \pm 607$| km s|$^{-1}$|. (Color online)
