Comparison of SN 2025ogs (black) to maximum-brightness (−3 < t < 3 days) composite spectra generated with kaepora (M. R. Siebert et al. 2019) for a variety of light-curve shapes (colored curves). The shaded regions are the 1σ uncertainties estimated via bootstrap resampling. The mean Δm₁₅(B) of the composite spectra ranges from 0.91 to 1.87. Overall the continuum and features are most similar to the Δm₁₅(B) = 1.43 composite spectrum (consistent with the light curve). The largest differences appear to be in the NUV (<3500 Å) and in the velocity of some spectral features (notably Ca II H and K, O I λ7774, and the Ca II NIR triplet).