Identified BLAs in the HST/COS spectrum of SDSSJ161940.56+254323.0. The panels show the best-fitting Voigt profile for each BLA in blue and the full model of the QSO spectrum in red. The dotted line shows the continuum level. Additional modeled transitions in the same wavelength range are labeled in red. The derived observational parameters column density log(N/cm⁻²), Doppler parameter in km s⁻¹, equivalent width in Å, and redshift are indicated in each panel, together with the reliability of the identification (see Sect. 2.7 for details). For saturated lines, our method leads to unrealistically large W_r uncertainties due to the poor column density constraint.