Example of the 1550 Å region used for profile ratio measurements. The Figure shows in black the observed spectra minus the continuum. The red dashed lines indicate the rest frame wavelength of CIV and He II, the gray area surrounding these lines show the ±1000 km s⁻¹ range of intensity measurement. The blue dashed lines indicate the BLUE emissions and are −4000 km s⁻¹ from their broad component companion, the gray area surrounding these lines also show the ±1000 km s⁻¹ range of measurement. Abscissa correspond to the rest frame wavelength in Å and ordinate normalized flux.