Final fate assignment in the (ξ_2.5, s_c) and (μ₄M₄, M_CO) planes, based on CCSN outcomes predicted by M16 over the set of S21, S23, S24, T24, and H16 SN progenitors. The red lines indicate the critical lower and upper thresholds of each explodability proxy considered, which are summarized in Table 2. The background color classifies the explodability based on these thresholds: a failed SN region (brown), a successful SN region (yellow) and unclassified, when using these two variables (blank). The fates of those collapsing stars that hitherto have not been classified are mapped out by a separation line in the (μ₄M₄, μ₄) plane (see right panel of Fig. 2).