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Figure 6
A special tool calculates and plots the wavelength results for each bunch in the FLASH2 pulse train in the form of a histogram for visualization of systematic wavelength changes along the bunch number. The example shows the result for operation at a set wavelength [\lambda_{\rm{und}}] = 12.0 nm with trains of 16 bunches. The OPIS measurement was made with xenon using three photoelectron features Xe 5p, #!4d5/2 and #!4d3/2 and a retardation voltage of 25 V. The individual as well as the mean wavelength values are plotted and show a flat distribution.

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