Stable ⁵⁸Ni yield at t = 1 yr past explosion versus radioactive ⁵⁶Ni yield at t ≈ 0 for various SN Ia explosion models (M_Ch models in red, sub-M_Ch models in blue). Chandrasekhar-mass models include: deflagrations (3D models of Fink et al. 2014; 1D W7 model of Mori et al. 2018), delayed detonations (3D models of Seitenzahl et al. 2013; 2D models of Kobayashi et al. 2020; 1D models of Blondin et al. 2013; 1D model 5p0_Z0p014 from this paper), and gravitationally confined detonations (3D model of Seitenzahl et al. 2016). Sub-M_Ch models include: detonations (1D models of Blondin et al. 2017; 1D 1 M_⊙ models of Shen et al. 2018; 1D models of Bravo et al. 2019; 1D models of Sim et al. 2010; 1D models of Kushnir et al. 2020), double detonations (3D models of Gronow et al. 2021; 2D models of Kobayashi et al. 2020; 2D model of Townsley et al. 2019), detonations in ONe WDs (2D models of Marquardt et al. 2015), violent WD mergers (3D models of Pakmor et al. 2011, 2012 and Kromer et al. 2013, 2016), and WD–WD collisions (2D models of Kushnir 2021, priv. comm.).