Each feature’s relative importance in determining whether a simulation will end as a Type III simulation. The feature variables are described in Table 3. The error bars represent the standard deviation for the feature importance as calculated from 50 different random forest models trained on the same data. T_ref,Lind and ΔT_χ,ref set the threshold for inner-core nucleation, while ν_LM,0 sets the CMB heat flow and thus whether a core will evolve to a state that promotes inner-core nucleation.