Fig. 2
From: Pre-critical fluctuations and what they disclose about heterogeneous crystal nucleation
Cluster formation and free energy of ice formation for the two substrates at 218 K. a Probability distribution of the size of the biggest ice-like cluster N cls. The inset shows the average composition of precritical clusters within 5 Å of the surface. b Probability distribution (blue) for the z component of the center of mass of ~100,000 precritical clusters. Positions of critical clusters are indicated in red. The water density is also indicated by dashed black lines (arbitrary scale). c Free energy profiles as a function of N cls
