Electromagnetic Wave Spectrum.
Horst Frank
CC BY-SA 3.0
<p><a href="//commons.wikimedia.org/wiki/User:Horst_Frank~commonswiki" title="User:Horst Frank~commonswiki">Horst Frank</a> and <a href="//commons.wikimedia.org/wiki/User_talk:Jailbird" title="User talk:Jailbird">Jailbird</a>,
</p>
<b>original SVG version:</b> <a rel="nofollow" class="external free" href="http://www.zeitmaschinisten.com/svg/Spektrum.svg">http://www.zeitmaschinisten.com/svg/Spektrum.svg</a>