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Figure 4
(a) Histogram of the arrival-time jitter for 6000 XFEL shots and (b) position stability for 1 h of optical laser (800 nm) measured at the XSS beamline. Width of the timing jitter was 42 fs (FWHM) and the position jitter (intensity-based center of mass) was less than 3% (r.m.s.) of the beam diameter. In the position measurement, a 250 µm (1/e2 width) focal spot was formed by the 1.5 m focal length lens.

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