This image of simple geometry is ineligible for copyright and therefore in the public domain, because it consists entirely of information that is common property and contains no original authorship.
This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Change image to represent UCP for different unit. The original can be viewed here: 2cer colour patch.png: . Modifications made by AustralianRupert.
Original upload log
This image is a derivative work of the following images: