I want to annotate the axis of a plot with text like the example chart. To be specific, I would like to annotate regions of the axes with different captions (XYZ, ABC, MNO, etc. shown in red).
I generated the chart using this example (plotting barchart): http://matplotlib.org/examples/api/barchart_demo.html
Could anyone please help me draw such line as well as add text along axes? Any pointer to an example is also appreciated. I am not sure how else to articulate what I want to do here other than describing with a picture.
