.. _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/photutils/aperture.html
.. _matplotlib: http://matplotlib.org/
.. _shapely: http://toblerity.org/shapely/manual.html
.. _wcsaxes: http://wcsaxes.readthedocs.io/en/latest/
.. _Github repository: https://github.com/astropy/regions
.. _PyAstro16 doc: https://docs.google.com/document/d/17owovjcpNFirz-f8qCWWxvcHHPGGpO5JJic5WbtD9JY/edit?pref=2&pli=1
.. _Region documentation: http://astropy-regions.readthedocs.io/en/latest/
