.. _pyregion: https://pyregion.readthedocs.io/en/latest/
.. _spherical_geometry: https://spacetelescope.github.io/sphere/spherical_geometry/index.html
.. _photutils: https://photutils.readthedocs.io/en/latest/aperture.html
.. _matplotlib: https://matplotlib.org/
.. _shapely: https://shapely.readthedocs.io/en/latest/
.. _GitHub repository: https://github.com/astropy/regions
.. _Region documentation: https://astropy-regions.readthedocs.io/en/latest/
.. _coordinated package: https://www.astropy.org/affiliated/index.html#coordinated-packages
