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**2023-06-09**
* New documentation cheat sheet
(https://github.com/NCAS-CMS/cf-python/issues/591)
* Performance improvements to `cf.aggregate`
(https://github.com/NCAS-CMS/cf-python/issues/640)
* New methods: `cf.Data.argmin`, `cf.Field.argmin`
(https://github.com/NCAS-CMS/cf-python/issues/577)
* Deprecate `cf.relative_vorticity` in favour of `cf.curl_xy`
(https://github.com/NCAS-CMS/cf-python/pull/643)
* Fix bug when using the ``-d`` option to the `cfa` script
(https://github.com/NCAS-CMS/cf-python/issues/649)
* Fix the return type from `cf.example_fields`
(https://github.com/NCAS-CMS/cf-python/pull/654)
* Fix `set_data` when the units are invalid
(https://github.com/NCAS-CMS/cf-python/pull/646)
* Fix `cf.Field.laplacian_xy`, `cf.Field.grad_xy`, `cf.curl_xy` and
`cf.div_xy` to work in cases when the dimension coordinates are
missing standard names
(https://github.com/NCAS-CMS/cf-python/pull/643)
* Changed dependency: ``cfunits>=3.3.6``
* Changed dependency: ``cftime>=1.6.2``
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