Contour plots can be used to show the variation of one variable across the data field. To add a contour layer to your plot, toggle-on "Contour" in the Plot sidebar.
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Additional options can be set on the Contour & Multi-Coloring Details (accessed via to the right of Contour in the Plot sidebar or Plot>Contour/Multi-Coloring) and the Contour page of the Zone Style dialog.
An example of each contour plot type is shown in Figure 9-1.
Figure 9-1. Contour plot types.
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