Blow-up of the 4600 Å (left-hand panel) and 6200 Å (right-hand panel) spectral regions during the plateau phase of SN 1996W. The x-axes are in expansion velocity coordinates with respect to the rest-frame position of Hβ and Hα, respectively. To guide the eye, two dash-dotted lines are drawn in the spectra marking the position of minima of the strongest absorption features, while red dashed lines, at comparable velocities, follow the HV Hα and Hβ features (~11 500 km s^-1). The blue dashed lines are tied to the second HV feature at ~12 500 km s^-1, which is visible only in the Hα region.