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Operation Toolpad > Mesh Command Button > Face Command Button > Delete Face Meshes
 

Since we only have one face, shift-click any edge of the bounding rectangle to select the face mesh we want to delete. The face you have selected should become red and the name of the face listed in the Delete Face Meshes window in the drop down box.

Now, because we don't want to delete the edge meshes, uncheck the Remove unused lower mesh box. Image Added
 
Click  Click Apply.

Check that the face mesh has been removed in the GAMBIT Graphics Window.

Remesh Edges

Since we are still going to use 100 divisions for the horizontal edges, we only need to remesh the vertical edges.

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