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Decluttering a Dual-Axis Chart

Amy Esselman only needs one Y axis:

You may be confused and overwhelmed at first. Dual-axis graphs like this are inherently challenging. Whether you call them dual-axis graphs, combo charts, or secondary y-axis graphs, they always demand extra effort from a reader to figure out which data series to read against which vertical axis. 

Click through for a variety of ways to improve a busy dual-axis chart.