(color online) STEM-HAADF imaging of a single Pt₃Co particle during in-situ annealing. ((a)–(c)) STEM-HAADF images at room temperature (a), 350 °C (b), and 550 °C (c). ((d)–(f)) The corresponding intensity profiles of images (a)–(c) along the yellow dotted boxes.^[69]