Extended Data Figure 2: Classification of potential atoms and non-atoms.
From: Deciphering chemical order/disorder and material properties at the single-atom level
a, Histogram of the identified local intensity peaks, each of which should belong to one of three categories: potential Pt atoms, potential Fe atoms and potential non-atoms (intensity too weak to be an atom). An unbiased atom classification method was developed to separate these peaks (Methods), resulting in 9,519 Fe (b) and 13,917 Pt (c) atom candidates and 5,889 non-atoms (d). Careful examination of the 5,889 non-atom peaks identified in (d) suggested that some potential atoms might be incorrectly classified into this category. To mitigate this problem, a less aggressive method was implemented to re-classify the non-atom category (Methods), producing 23,804 atom candidates (e) and 5,521 non-atoms. Using the same unbiased atom classification method, we classified 23,804 atom candidates into 9,588 Fe (f) and 14,216 Pt (g) atom candidates.
