Scenario: You have to represent in a chart two series of data that are very different. For example, one is in the order of tens the other of hundreds of thousands.
Solution: Use a secondary Y-axis, and connect it to the series.
In Chart Wizard, go to Diagram and then to Elements tab, and add a secondary axis Y to the chart.
Then assign the axis to the series by going to Series Views, select the series name from the drop down menu, and assign it the desired axis.
It is possible to change the colour of the labels of the axis in order to make it more clear which axis is assigned to which series, by going to axes – General – Text Settings.
And the output is the desired one: