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• don't change geometry
• if you do change geometry have a way to get new geometry info in a standard way
• stable beam-center (um, jets 50um). standard way to get beam center
• stable jets
• make jets/beam comparable unless you needstable need stable to a pixel-size
• stable experimental setup
• don't switch between sparse/dense photon cases for spectrometer, and/or understand in advance
• measure detector tilts
• avoid double-beam-focus seen in SPI