Part of series: DD011 – Data-Driven Chart 011 Line Charts
This is a dual-scale line chart. These line charts show trend, but they also show it in different units or in comparison with another type of data. The values are not shown because the trend is the most important message. The best practice for line charts is to use the axes as the value indicators, which is the exception to most chart types.
These charts are typically used to show only one line per y axix. You can add lines, however. Just be sure that you assign the new data to the primary (left) or secondary (right) axis so your data will plot correctly. Then also add a line legend.