Our spectrum of SN 2009dc about 281 d past maximum, and a few comparison SNe with days relative to maximum light indicated for each spectrum (in parentheses). The spectra from top to bottom are the normal Type Ia SN 1998bu (Jha et al. 2006), SN 2009dc, SN 2006gz (Maeda et al. 2009), SN 1990N (via SUSPECT) and the peculiar Type Ia SN 2002cx (Jha et al. 2006). Major spectral features are labelled. All spectra have had their host-galaxy recession velocities removed and have been dereddened according to the values presented in their respective references.