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(a) optical micrographs of the worn ta-C coated cylinder after the test under thin film mixed ML conditions and details of the wear scar on the generatrix of the cylinder. The size of the X-ray beam for surface analysis is also shown. (b) Line-scan analysis on the C1s photopeak across the wear scar in the middle of the cylinder. Inside the wear scar, the shift of the C1s peak to a lower energy is clearly visible.
