v_Hα/v_{Fe 5169} ratio (left panel) and v_Hβ/v_{Fe 5169} ratio (right panel) compared to the rest frame epoch (from explosion). The thick dotted lines represent the v_{H α} /v_{Fe 5169} and v_{H β}/v_{Fe 5169} ratios for the individual SNe as well as the averaged ratios. For reasons of better visibility the uncertainty is depicted only for the averaged ratios and not for the fitted velocity ratios of the individual SN. Thecircle markers represent the measured v_{H α} /v_{Fe 5169} and v_{H β}/v_{Fe 5169} ratios for those epochs and SNe where spectroscopic data was available and both Hα (or Hβ) and the Fe ii λ5169 velocity could be measured. The yellow shaded band in the right panel corresponds to the ratio of v_{H β} /v_{Fe 5169} = 1.19 as given by Poznanski et al. (2010).