High-resolution hydrogen and metal absorption lines associated with the z_abs = 1.9410 system toward HS 1103+6416 (black curves). The synthetic profiles calculated with the UV SEDs shown by the shadowed area in Fig. 5 are plotted by red curves. The zero radial velocity is fixed at z = 1.9410. The inserted figures in Si iv panels display the synthetic spectra (blue curves) calculated with the first-guess SED (red dotted line in Fig. 5).