Fig. 7
Top: ℛ(Si ii) and 
(Si ii) versus SN decline rate Δm15. Comparison data and sub-classes from Benetti et al. (2005), updated with measurements by Hachinger et al. (2006) and Taubenberger et al. (2008). Bottom: pEW (Si iiλ5972) versus pEW (Si iiλ6355). Comparison data and sub-classes from Branch et al. (2009). SN 2011fe is represented by a filled red circle on all panels.
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