Evolution for all models of the Chandrasekhar mass (solid lines), computed using Eq. (19). Also shown is the iron core mass (dotted line) defined by the mass coordinate where the sum of elements heavier than ⁴⁸Cr goes below 0.5. Furthermore, we show the degenerate iron core mass that we defined in Eq. (20). In the left panel are shown the GENEC models and in the right the MESA models.