A cycleplot with bars
I love cycle plots. When is comes to displaying change over time they are much better than a standard line chart when there is a strong seasonality.
The other version of a cycle plot available in the Excel Charts Shop is the standard one. The seasonality becomes visible but it is not explicitly represented. In this case, you use a line to represent the average value for each month and then use the small bar charts to display the data for each period.
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