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How to select only nodes on the surface

Some times you need to select nodes only on the surface of the mesh. This can easily be done if the mesh is displayed in the surface mode (see ``Toggle Surfaces/Volumes'') using the menu-entry ``Show Elements With Light'' or if you just plot the element-faces (see ``plot'' with parameter ``f''). To find node possitions more easily add the element edges to the view (see Toggle Element Edges).