Similar to Figure 3, but showing the UDF mosaic AGN 601381485 (z = 3.19) (top) and object 604992563 (z = 3.80) (bottom). The latter object has a lead line redshift blue-wards of the Lyα peak as indicated by the vertical gray lines. Even when assigning the objects redshift according to a fit of the Lyα profile, as described in Section 8, the offset of the Lyα emission with respect to systemic as traced by the C III still has an intriguing value of −145 km s⁻¹.