Network used in all GENEC models from core C-burning onwards. Squares filled with a plus sign denote isotopes explicitly evolved in the nuclear reaction network. Squares filled with a blue dot are isotopes implicitly included in the α-chain. By this we mean that along the α-chain are included not only the (α, γ) reaction but also the (α, p) (p, γ) reactions without explicitly evolving the intermediate isotope abundance. With such a network, we get a good estimation of the energy generation rate (see Timmes et al. 2000, for details). Additionally, compared to the previous GENEC network, we have the approximate electron capture from ⁵⁶Ni to ⁵⁶Cr to mimic pre-supernova Y_e evolution. This network is very similar to that of the 22-isotope network of Farmer et al. (2016); we note that in Fig. 1 of that paper only 21 isotopes are flagged in the 22-isotope network, but ⁵⁶Co is added to the network making 22 in total. Compared with that network, we track explicitly extra iron group isotopes, namely ⁵⁷Co along with ⁵³Fe and ⁵⁵Fe, and thus in total we track 25 isotopes explicitly.