Continuous_Discrete_minor_edits to graphs

Thank you for all your work on this. These are looking great! I noticed a few minor items on the graph that will improve it.

On-screen graph; split y-axis toggled A. The text between the two labels on the split graph are overlapping. B. I would include a 0 line for the bottom graph. C. I would include a upper line with a number for the top of both graphs. Currently, it looks like the bottom graph goes from 0.8 to 0.