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This package defines units used in the CDS format, both the units
defined in `Centre de Données astronomiques de Strasbourg
`_ `Standards for Astronomical Catalogues 2.0
`_ format and the `complete
set of supported units `_.
This format is used by VOTable up to version 1.2.
These units are not available in the top-level `astropy.units`
namespace. To use these units, you must import the `astropy.units.cds`
module::
>>> from astropy.units import cds
>>> q = 10. * cds.lyr # doctest: +SKIP
To include them in `~astropy.units.UnitBase.compose` and the results of
`~astropy.units.UnitBase.find_equivalent_units`, do::
>>> from astropy.units import cds
>>> cds.enable() # doctest: +SKIP
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Enable CDS units so they appear in results of
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`~astropy.units.UnitBase.compose`. This will disable
all of the "default" `astropy.units` units, since there
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