Extended Data Fig. 1: Spatial distribution of foreign particles and nuclei at initial configuration.

a,b, Initial distribution of nuclei and foreign particles for two growth modes. Foreign particles are labelled in pink. Left panels: Nuclei are shown in light blue. Right panels: Shaded areas represent the distribution of foreign particles within nuclei. c, Density variance 〈δρ2〉 of foreign particles at the initial stage of nucleation for both growth modes. Five samples of MR growth modes and four samples of CG mode are analyzed. The CG mode curve represents the mean values of four measurements, with error bars indicating their upper and lower bounds.