[3]The authors acknowledge the Consortium Lyon Saint-Etienne de Microscopie (CLYM) for the access to the microscopes and the company LFG for having kindly provided the K-kit cells. They also acknowledge the China Scholarship Council (CSC), Institut Universitaire de France (IUF) and the CNRS network “Microscopie Electronique et Sonde Atomique” (METSA, FR CNRS 3507) for financial support.
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