The sherpa.plot.pylab_area_backend module
This module contains a modified Pylab backend.
The backend is fully functional and can be used in real applications, but its main purpose is to serve as an example of inheritance in backends.
For that purpose, it is convenient to split it out into its own file, so that specific line numbers from this file can be directly included in the documentation.
A Matplotlib backend displaying data uncertainties as shaded regions