.. _ref_config:

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Configuration of quantity data
==============================

The ``cfg.yaml`` file contains these tables predefining quantity data:

- ``dimension_order``
- ``multipliers``
- ``unit_systems``
- ``base_units``
- ``derived_units``
- ``api_quantity_map``

To use custom data, such as units, unit systems, and multipliers, or to update, add,
or remove any predefined quantity data, you must manually modify the ``cfg.yaml`` file.