Graph plotting the radius (in standard solar radii) against the mass (in standard solar masses) for a model white dwarf star consisting of a cold Fermi gas.  The blue curve shows a nonrelativistic model and the green curve a relativistic model.  The molecular weight per electron has been taken to be 2. "M<sub>Ch</sub>" denotes the Chandrasekhar mass limit.  See:
<a href="//commons.wikimedia.org/wiki/User:AllenMcC." title="User:AllenMcC.">AllenMcC.</a>, vectorisation by <a href="//commons.wikimedia.org/wiki/User:Chrkl" title="User:Chrkl">chris</a> <a href="//commons.wikimedia.org/wiki/User_talk:Chrkl" title="User talk:Chrkl">論</a>
<a href="//commons.wikimedia.org/wiki/File:WhiteDwarf_mass-radius.jpg" title="File:WhiteDwarf mass-radius.jpg">WhiteDwarf_mass-radius.jpg</a>: <a href="//commons.wikimedia.org/wiki/User:AllenMcC." title="User:AllenMcC.">AllenMcC.</a>.