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This also doesn't include the "slippage resolution." That is, if they're using the full undulator, then by the end the x-rays can have slipped out of the electron slice by ~3 fs for soft x-rays. Obviously not a small number if trying to make 5 fs pulses. They've been advised to not use the full undulator when shorter pulses are more important than number of photons.

Tips for XTCAV Analysis

• Look at the distribution of the "agreement" parameter that is returned by the ReconstructionAgreement() method.  This value represents the "dot product" of the power-spectrum from the first-moment-analysis of the XTCAV image with the power-spectrum from the second-moment-analysis of the XTCAV image.   Only believe the data where the agreement is good (in the past >0.5 has been useful for some analyses)
• Ignore shots where the X-ray intensity is low, but cutting on the FEEGasDetector value to select stronger shots