I pushed out a quick change to PythonDBAGraphs to automatically save the data for any graph that you make so that you can redraw the graph later. This is better than saving an image file because the redrawn graph lets you see details about the points on the graph when you hover the mouse over the points.
Now when you generate a graph you get a line like this:
Saving data in C:\temp\ASH active session count for MYDB database.txt
When you want to see the graph again you run show_saved.py like this:
python show_saved.py Enter name of data file to be restored: C:\temp\ASH active session count for MYDB database.txt