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This math image could be re-created using vector graphics as an SVG file. This has several advantages; see Commons:Media for cleanup for more information. If an SVG form of this image is available, please upload it and afterwards replace this template with {{vector version available|new image name}}.
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http://en.wikipedia.org/wiki/Image:Quadric_Parabolic_Cylinder.jpg This image is ineligible for copyright and therefore is in the public domain, because it consists entirely of information that is common property and contains no original authorship.