Vertically Stacked Axes Chart
The chart above is a regular, single XY chart although it might look like a multi-panel chart with two value axes. We have a similar chart here. The only real difference is that instead of arranging Y axes side by side we stack them one above another. So the result is quite the same as a multiple-panel chart with shared x-axis.
For more gritty details about stacked, examples, and code visit this tutorial.