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In order to keep the filesizes small to avoid issue when analysis the smallData files, we try to extract the important information gleaned from areaDetectors at an event-by-event basis and only save these pieces of data. 

Typical forms of userData

Typical forms of userData

In addition to the points made above, there are a few more section to add if you are adding "userData" (reduced area detector data).  SmallDataProducer_userData.py has examples for the most standard requests. Parameters that are important for the production (ROI boundaries, centers for azimuthal projections,...) are stored in the "UserDataCfg" subdirectory.

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