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SEM images of NEAs with holes 500 nm in diameter with gold electrochemically deposited inside for 0 s (a); 10 s (b); 20 s (c); and 30 s (d). Estimated recession depths: (a) 450 nm; (b) 300 nm; (c) 150 nm; (d) 0 nm (reprinted with permission from [68]).
