Average of the objects
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The average of the layers of all marked objects consists of the layers that are valid for all marked objects. By Apply, the marked objects will be put in each layer of the average set.
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Union of the objects
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The union of layers of all marked object will be chosen. By Apply, the marked objects will be put in each layer of the union.
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Keep existing layers
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The selected layers will be added to the layers that are already used for the object.
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