space, we then constructed a Markov State model able to yield model-free estimates of the nucleation rate of the committor surface in order parameter space, thus providing a quantitative description of the emergent nucleation mechanism. The MSM reveals that when 𝑆 = 3.7, both one and two-step nucleation mechanisms are indeed accessible, with the two-step nucleation pathways being slightly more favourable. Interestingly, the analysis of the committor probability surface in the 𝑛, 𝑛(𝑞 6 ) space suggests that at these conditions, one may need to extend the attribute 'critical'