\begin{ccRefFunction}{radical_plane}

\ccHtmlNoLinks
\ccFunction{Plane_3<Kernel> radical_plane(const Sphere_3<Kernel>& s1,
					  const Sphere_3<Kernel>& s2);}
{returns the radical plane of the two spheres. 
\ccPrecond{$s1$ and $s2$ are not cocentric.}}

\end{ccRefFunction}