hibou.config.EXTENSIONS
=======================
This ``tuple`` stores the extensions for the figures. By default it contains only ``"png"``. All the image format supported by ``matplotlib`` can be given. 


For instance, if you leave the default value, all the figures plotted by ``hibou`` will be saved in PNG format. If you precise: ``config.EXTENTIONS = ("png", "svg")``, the figures will be saved in PNG and SVG format.