Converted by Fake User (in Wikipedia English) into SVG, original image obtained at <a rel="nofollow" class="external free" href="http://www.wisegorilla.com/publicdomain.html">http://www.wisegorilla.com/publicdomain.html</a>, which claims that it's in the public domain.
No machine-readable author provided. <a href="//commons.wikimedia.org/wiki/User:Airridi~commonswiki" title="User:Airridi~commonswiki">Airridi~commonswiki</a> assumed (based on copyright claims).
No machine-readable source provided. Own work assumed (based on copyright claims).