Covariances and normalized posterior densities of model M₃. Theoretical predictions of the initial ^54,56Fe and ⁵⁷Ni fraction of various explosion models are indicated by green (Near-Ch-mass) and orange (sub-Ch-mass) symbols. Theoretical predictions with too little (<0.4 M_⊙) or too much (>0.8 M_⊙) ⁵⁶Ni compared to Branch-normal SNe Ia are marked as empty symbols. Black lines show the 1, 2, and 3σ credibility regions. Numbers next to the 1D histograms indicate the 68% credibilityrange of the individual parameters. Models: Del. Det. (Seitenzahl et al. 2013; Ohlmann et al. 2014; Nomoto & Leung 2018), Deflag. (Fink et al. 2014), new W7 (Nomoto & Leung 2018), CONe Defl. (Kromer et al. 2015), Grav. Conf. (Seitenzahl et al. 2016), CO Det. (Sim et al. 2010; Nomoto & Leung 2018), ONe Det. (Marquardt et al. 2015), Double Det. (Sim et al. 2012), V. Merger (Pakmor et al. 2010, 2012; Kromer et al. 2013, 2016).