Ratio of the ejecta mass to ⁵⁶Ni  mass is plotted against the ⁵⁶Ni  mass. With decreasing ejecta mass the black points are SNe 2005ke, 2006mr, 2007on 2007ax and 2009F, the last two of which lack NIR coverage. The diamonds are the SN Ia-faint  sub-group and the square is 2007on which is fast-declining but not in the sub-group. The red points are normal SN Ia taken from Scalzo et al. (2014). We also plot the values from different model scenarios. The yellow squares are sub-M_Ch double detonation models from Sim et al. (2010), blue squares from violent merger models for normal and subluminous SNe from Pakmor et al. (2010, 2012), the green curve is the ratio for a M_Ch explosion and the magenta curve is the ratio for a sub-M_Ch explosion with M_ej of 1 M_⊙. We plot the typical error bar for the normal SNe from Scalzo et al. (2014) in red.