By default, all pens use the same vertical axis. You can define multiple axes. Each axis can be used just for one pen, but it can be also shared by multiple pens. To add a new axis:
1. Click on the “+ Add Pen” dialog. Now click on the “…” button next to Second Axis.
2. You will be presented with the Axes Settings Dialog:
3. In the dialog, you can add a new Axis and set its parameters like auto-scale, location, and name.
4. Once you have created the new axis, you can select it for a given pen:
5. Now you can look at how the trend will look with multiple axes.