Individual spectra of Si IV 1393.757 Å and 1402.772 Å profiles with two spectral components. First column of panels: Si IV 1393.757 Å profiles; second column: Si IV 1402.772 Å profiles. The histogram line shows the data and continuous lines show the double Gaussian fit and also the two Gaussian components forming the fit of each profile. The y-axis is in counts and the x-axis in Angstroms. The vertical dashed line shows the rest position of the Si IV lines. In the first column, each panel shows the intensity ratio r₁, r₂, and the ξ₁, ξ₂ from the corresponding Gaussian components.