Section of the TUES observation around Ly α (black). The interstellar H I absorption was calculated with N_{H I} = 1.8 (full, red) ± 0.5 (dashed, red, 2.5 times the estimated error range for clarity) × 10²⁰ cm⁻². The pure stellar spectrum is shown in blue. A rotational line broadening (v_rot = 37.5 km/s) is applied. Interstellar metal lines are not modeled in this plot. The P Cygni profile of the N V resonance line is marked at the top.