Upper: Normalized spectra of SNe Ib in our sample till maximum light in the range of 5000–7000 Å, showing the features around Hα. The spectra of different SNe are plotted in distinct colors and shifted vertically for better illustration. The main absorption features are highlighted with distinct colored shaded areas. The green bands in the areas denote an absorption line of ambiguous origin that appears concurrently with the blue-wing structure. Lower: Normalized spectrum of SN 2015ah at −8-d showing the range of the doublet feature near 6200 Å. Synthetic spectra by SYNOW with either HI (solid red line) or Si II (dashed blue line) are also overplotted.