Optical spectrum of SN 2005at shown in comparison with the spectra of the type Ic SNe 1994I (Filippenko et al. 1995), 2002ap (Foley et al. 2003) and 2007gr (Hunter et al. 2009; Crockett et al. 2008). The spectra are dereddened and the wavelengths corrected to the host galaxy rest frame. Furthermore they are arbitrarily scaled and shifted for clarity. For SN 2005at AV = 1.9 mag is assumed based on the light curve analysis. Epochs are given relative to the estimated R-band maxima of the SNe. The comparison spectra have been obtained from the Weizmann interactive supernova data repository (Yaron & Gal-Yam 2012).
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