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layout XL extract cellviews in hierarchy?

In Virtuoso Layout XL->Extract layout, what is the function of the Scope setting "Current Cellview and Cellviews in Hierarchy", and of the "Save Extracted Cellviews" button? Does that Scope setting "flatten" those selected cells in memory before running extract?

I would like a way to extract a few cells in the hierachy, which typically contain just custom wires, without having to use the option "Extract connectivity to level" greater than 0, which slows down the extraction; does the Scope setting "Current Cellview and Cellviews in Hierarchy" do that?

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