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(A) Number of counts detected per FEL shot, proportional to the RXES signal, as a function of number of shots with 6 μJ/pulse FEL. After the first few thousand shots, the count rate decreases indicating the sample damage. The RIXS signal at 1 eV (B) is still present when summing the first 4000 and the last 32000 measurements. The elastic lines in the spectra are normalized to unity.
