SDSS 2006 continuum-normalized spectrum of J1538+0855, showing highly blueshifted (> 0.1c) BAL signatures (A, B, and C) associated with CIV absorption, bluewards of the SiIV emission line. In light pink are indicated absorptions below 90% of the continuum. Green-dashed lines represent the minimum and maximum velocity estimated for the BAL outflow in each trough, respectively. The horizontal dashed line represents the 90% level of the continuum-normalized flux (solid line).