The context graph shows the years that the electrical data is over with a brush to limit the range. I think the brush would be more effective for data over more than 3 years, and I plan on synthesizing data to create a wider range (10 years or more).

I was almost able to get the filtering to work; however, I ran into a situation where I was endlessly recursing in the brush function since I called back to re-render the graph and the brush function got called again. I suspect I need to separate the brush bar graph out into a separate file and function so that I can call the refresh on the readial stacked bar chart. I will have to work on that the remainder of this week.