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When you select a popular spread from the drop-down list, the expression is built automatically for you. You may also create your own custom spread chart by entering the mathematical calculation. The calculated results are displayed as a line chart. Additionally, an expression can be added to the main chart window, or as a new pane on the chart (you'll choose the placement when you create the expression).
If you want to create your own custom expression, you can enter the calculation directly into the expression field.