Atomic form factors of oxygen (blue), chlorine (green), Cl- (magenta), and K+ (red), calculated with the Cromer-Mann parameters.
<a href="//commons.wikimedia.org/wiki/User:Pieter_Kuiper" title="User:Pieter Kuiper">Pieter Kuiper</a>
<span class="int-own-work" lang="en">Own work</span>