Adding a Reference Line
You can define reference lines to show important values on your chart; for example, the average and maximum prices of your company's products.
Context
There are two types of reference lines: fixed and dynamic.
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Fixed reference lines are created with a specific reference value, and don't change when you change the data in your chart (for example, if you filter your data).
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Dynamic reference lines are updated when filters, ranking, and sorting are applied to the chart. Dynamic reference lines can be used with any measure, including story calculation measures.
When you add a reference line, you can choose to fill the background area above and below the line with color. Reference lines are maintained when you change the chart type.