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If your scanner has a moveable optical system, you are able to specify both
Width, Height and Vertical offset for transmission frames, but reflective
frames are still limited to the few fixed widths because of the white
calibration used in reflective mode.
• If you want to specify a frame with 2 apertures you can do so by
clicking the Split Frame... button.
• From the Split frames pop-up select how many equally sized apertures
you want to split the frame into and click Create.