choice. This image is a derivative work of the following images: File:Shapedda1.png licensed with Cc-by-sa-3.0, GFDL 2009-09-01T16:53:32Z Pcirrus2 597x392
File:ShapeDDA1.svg is a vector version of this file. It should be used in place of this PNG file when not inferior. File:Shapedda1.png → File:ShapeDDA1