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Pruning data removes some part of data held by a HeaderObject. See also Filtering Data and Stripping Data.
Pruning occurs while the header object is on its way to the output file, after it has been removed from the TES and AES. Pruning is useful in that it can make the data files smaller while still retaining the relationships between the HeaderObjects and retaining certain some of the sub-objects held by HeaderObjects.
Pruning is controlled by defining certain environment variables (actually merely defining them is enough, they don't have to take a value).
To remove all SimHits from a SimHeader set the environment variable:
export NUWA_PRUNESIMHITS 1
The electronics simulation truth information can be pruned by setting
export NUWA_PRUNEELECSIM 1
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