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Some times you need to select nodes only on the surface of the mesh. This can be done when the mesh is displayed in the surface mode (see ''Toggle Surfaces/Volumes'') using the menu-entry ''Show Elements With Light''. To find node positions more easily add the element edges to the view (see Toggle Element Edges).
How to select only nodes on the surface
A different way uses the element-faces (see ''plot'' with parameter ''f''). Store the desired faces in a new set (qadd) and complete the set downwards (``comp set do''). Check the selected nodes with ``plot n setname''.