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To create contour lines for an existing surface from the Surface and Volumes click Surfaces.
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Select a surface from the list and click Properties.
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Open Contour lines page.
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Contour lines: activates the visualization of the contour lines of the surface.
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Contour step: step to use to draw the contour lines.
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Contour color: color to use to draw the contour lines.
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Click Accept to draw the contour lines.
