A chart legend can be set on the x, y or z axis enabling you to shift your focus to data listed on a particular axis. This is a great way to view values on the selected axis without having to view another chart report.
The following three examples shows how to set the legend on different axes to alter the appearance and data shown by the same chart.
In the first example, the legend has been set on the x axis:
In the second example, the legend has been set on the y axis:
In the third example, the legend has been set on the z axis: