Normalized, coadded spectrum of SMSS J2157, overlaid with the best-fit model (red curve) for the EHVO features of the CIV doublet (three blue-red pairs of dashed Gaussian components for modeling 1548,1550 Å lines respectively), NV doublet (three blue-red pairs of dotted Gaussian curves for modeling 1238,1242 Å lines respectively), Lyα (three blue dash-dotted Gaussian curves), and SiIV doublet blended NALs (seven green-purple pairs of dotted Gaussian components for modeling 1393,1402 Å lines, respectively). The spectrum was normalized to the reconstructed model at λ > 1275 Å and to the extrapolated continuum λ < 1275 Å.