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Figure 9
Two-dimensional histogram of the measured photon energy as a function of the bunch number for the first 10000 shots of our PCA test data set of 90000 pulse trains of 80 bunches each. The data are taken from a measurement at [\lambda_{\rm{und}}] = 52 nm with argon as a target gas in OPIS. The decrease of the photon energy within the first ten bunches is caused by ion space charge of previous pulses.

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