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In AIDA system, various analysis objects are created by the factories.
(Concerning AIDA itself, see AIDA webpages)

For exmple:

1. An analysisFactory creates treeFactories which create trees.
2. An analysisFactory also creates plotterFactories by taking a tree as an argument.
3. A plotterFactory creates plotters which create plotting regions in their area.
4. The .plot() method of a region plots various analysis objects like histograms, clouds etc.

overview.py

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