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Surface contamination resulted from deposition of milled material. (a) Overview of milled area (b) E. coli cell located in the milled region. (c) E. coli cell located outside the milling area, no artifacts are observed. The solid black dots are gold fiducial markers. The white arrow indicates the artifacts that show regularity and the black arrow indicates the “blob-like” artifacts. The scale bars are (a) 1 μm, (b and c) 100 nm.
