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I have imported a dxf file into KLayout for the purpose of making it a gds file. The file has arrays of rings (i.e. an outer and an inner radius, nothing in the middle). But when I import it into KLayout the middle of each ring is filled (i.e. its shaded in). The circle that forms the outer circumference and the circle that forms the inner circumference are in the same layer. Is there some way to do a global difference operation to remove the inner portion? Highlighting the array and clicking on Diff in the tool bar didn't work.