Normalized spectrum of PSO J067−14, smoothed to 500 km s⁻¹. The velocity axis in each panel is relative to the rest-frame wavelength of the ionic species indicated by the label. The vertical solid, dashed, dotted, and dash-dotted lines indicate the velocity associated with the C IV, Si IV, N V, and Mg II emission lines, respectively. The solid (dashed) horizontal line represents a flux level of 1.0 (0.9). BAL troughs, corresponding to a flux level <0.9 (Weymann et al. 1991), are highlighted as shaded green areas. The shaded red area indicates a potential extremely high-velocity (∼47 000 km s⁻¹) C IV BAL.