Plot of pumping speed as a function of pressure for a diffusion pump.
<a href="//commons.wikimedia.org/wiki/User:%D0%94.%D0%98%D0%BB%D1%8C%D0%B8%D0%BD" title="User:Д.Ильин">Д.Ильин</a>: vectorization, translation
<a href="//commons.wikimedia.org/wiki/File:DP_pumping_speed_plot.png" title="File:DP pumping speed plot.png">File:DP_pumping_speed_plot.png</a> by <a href="//commons.wikimedia.org/wiki/User:Kkmurray" title="User:Kkmurray">Kkmurray</a>