High-resolution lines observed in the z = 1.8916 system. Brackets indicate the sub-systems A, B, C, and D with strong lines, vertical ticks in the C iv panels point to superimposed sub-systems with weak absorption lines. The synthetic profiles for metal ions (red) in the sub-system A are calculated with broken power-law SEDs from the grey shadowed area in Fig. 10. The black line in the O i panel is a restored profile from the forest absorption shown in the insert. The black and blue curves in the insert are the original and deconvolved profiles, respectively.