Question

what is Secondary Axis​

Answer 1

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The scale of the secondary vertical axis shows the values for the associated data series. A secondary axis works well in a chart that shows a combination of column and line charts. You can quickly show a chart like this by changing your chart to a combo chart.

Answer 2

Answer:

when the values in a chart vary widely from data series to data series, you can plot one or more data series on a secondary axis. a secondary access can also be used as part of a combination chart when you have mixed types of data (for example, price and volume) in the same chart.