Optical spectrum of SN 2005at (black) dereddened with different values of host galaxy extinction, overlaid with the spectra of SN 2007gr (red) obtained 14 days after the R-band peak (Crockett et al. 2008). The best match in the spectroscopic comparison is achieved with SN 2005at host galaxy extinction of AV = 1.8 mag, which is consistent with the adopted AV = 1.9 ± 0.1 mag derived based on the light curves. The spectra are scaled and shifted for clarity.
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