Top: Phase-averaged COS spectrum in F_λ (in black), with errors in light gray. The vertical bands in both panels mark the position of the absorption lines, with the blue one corresponding to the absorption line at 1344 Å, as in the top panel of Fig. 4; Bottom: Positions of a suite of C II–IV (black), Si II–III (purple), and N V (red) ionic transition components as a function of magnetic field strengths. Only transitions with a relatively large oscillator strength at 500 MG have been plotted. It can be seen that the π components of the Zeeman-split lines do not deviate far from the wavelength range where most of the absorption lines in the UV spectrum are located.