[⁴⁵Ti/⁵⁶Ni] ratio of our mass estimates and several supernova explosion models. The red line marks the solar [⁴⁴Ca/⁵⁶Fe] ratio (1.2 × 10⁻³; Anders & Grevesse 1989), which is used as a reference criterion to judge supernova model subtypes. Ejected ⁵⁶Ni masses for Cassiopeia A, SN 1987A, Tycho, Kepler and G1.9+0.3 are taken from (Eriksen et al. 2009; Woosley et al. 1987; Badenes et al. 2006; Patnaude et al. 2012; Borkowski et al. 2013), respectively. Vela Jr. ⁵⁶Ni ejecta mass is modeled from a 25 M_⊙ star (Maeda & Nomoto 2003). Model yields are from Wongwathanarat et al. (2017), Maeda & Nomoto (2003), Seitenzahl et al. (2013), Fink et al. (2014, 2010).