template<class VERTEX>
pPolytope createCorrelationPolytope(const Vertex::System& s1, 
                                    const Vertex::System& s2)
{ return pPolytope(NULL); }
pPolytope createCorrelationPolytope<ReducedVertex>(const Vertex::System& s1, 
                                                   const Vertex::System& s2)
{ return createCorrelationPolytopeReduced(s1, s2); }
pPolytope createCorrelationPolytope<FullVertex>(const Vertex::System& s1, 
                                                const Vertex::System& s2)
{ return createPolytopeCopy(*createCorrelationPolytopeReduced(s1, s2),
                            FullVertexFactory()); }