.. _pyregion: http://pyregion.readthedocs.io/en/latest/
.. _spherical_geometry: http://spacetelescope.github.io/sphere/spherical_geometry/index.html
.. _photutils: http://photutils.readthedocs.io/en/latest/aperture.html
.. _matplotlib: https://matplotlib.org/
.. _shapely: http://toblerity.org/shapely/manual.html
.. _Github repository: https://github.com/astropy/regions
.. _Region documentation: http://astropy-regions.readthedocs.io/en/latest/
.. _affiliated package: http://www.astropy.org/affiliated/index.html
.. _get help: http://www.astropy.org/help.html
