******** backends ******** .. toctree:: backend_bases_api.rst backend_managers_api.rst backend_tools_api.rst backend_gtkagg_api.rst backend_qt4agg_api.rst backend_qt5agg_api.rst backend_wxagg_api.rst backend_pdf_api.rst backend_svg_api.rst .. backend_webagg.rst dviread.rst type1font.rst