The canvas that lies underneath the original content, but on top of the Underlay. You define the appearance of this layer by adding shapes to it.
This underlay uses a coordinate system that does respect page orientation and/or any clipping area. The Layer will placed exact on the resulting visual area shown in a viewer (e.g. Acrobat Reader). Note that if no rotation and/or clipping is available that this has the same result as the normal overlay.
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