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Width. When calculating where the Screen is that you're presenting from, Upoint uses 3D marker lines that pass through the corners of the Screen. Mathematically, in a perfect world, 3 lines through 3 corners uniquely determine a rectangle with horizontal and vertical sides. In practice, however, measurements as well as a user's aim are never perfect. Because of this, Upoint sometimes finds more than one solution that conforms to the marker lines defined by the user. To help constrain the possible solutions Upoint finds, various sliders in Settings can be used to tell the system which solutions Upoint should deem acceptable - such as the minimum and maximum ratio Width of the found rectangles.