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A SEM image of the surface of the oxidized sample with composition 3 (base+2.5%Mo-1.5%Ta-1.5%La-0.5%Ru) under magnification: (a) ×1000; (b) ×2000; the element distribution maps: (c) O; (d) Al; (e) Cr; (f) Mo; and (b) the lamella cutting site.
