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To fully exploit ultra‐short X‐ray pulse durations routinely available at X‐ray free‐electron lasers to follow out‐of‐equilibrium dynamics, inherent arrival time fluctuations of the X‐ray pulse with an external perturbing laser pulse need to be measured. In this work, two methods of arrival time measurement were compared to measure the arrival time jitter of hard X‐ray pulses. The methods were photoelectron...