In certain situations, we want to provide more information in one graph. This is when we can combine two (or sometimes even more) types of charts. A classic example of a combo chart is the combination of an area or bar chart with a line chart.
To combine two types of charts, we need to add a secondary axis. In the example in which we combine an area and a line chart, we can use the primary vertical axis to display the area scale, while the secondary axis allows us to display the scale necessary for the line chart.
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